Could not execute script site/index.php

Hi folks,
I am using hostgator baby cloud plan to host my website.
Some times my site goes down with error 500 internal.
I am running 3 websites but traffic is not much to down my website.
Only 4000 visitors per day.

This errors are coming when I move my website from one directory to another.
What I did exactly is :

I was running website androidswift.net and decided to move on new domain. Then I purchased new domain(apkset.com) and added to my hostgator account using ad-one domain. The I copied files from androidswift.net directory to apkset.com and setup a 301 redirect. So anyone go to androidswift.net it will redirect apkset.com

But after doing this I am getting this error (error logs are bellow).

I did a whole process to move site to new domain.

Created a new database and uploaded the backup database to new.
copied files properly and changed site url to apkset.com also.
Created new .htaccess file.
Manually did a fresh installation of all plugin and configured.

If we talking about resource then one year ago when I was running androidswift.net was getting 10000 visitors per day. And everything was perfect. so there is not problem of resources.

Bellow the post I am sharing a error log which is full of errors.

[Thu Mar 16 01:51:38 2017] [error] [client 8.37.225.230] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/jio4gvoice-apk-download/
[Thu Mar 16 01:47:29 2017] [error] [client 168.235.207.88] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/droidfedo.net/index.php”, referer: https://www.google.com/search?q=gta%20vice%20city%20android%20full%20game%20and%20obb%20download&clientAction=534.click&ie=ISO-8859-1&btnG=Search
[Thu Mar 16 01:47:28 2017] [error] [client 168.235.207.88] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/grand-theft-auto-san-andreas-apk-download/
[Thu Mar 16 01:47:28 2017] [error] [client 168.235.207.88] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/grand-theft-auto-san-andreas-apk-download/
[Thu Mar 16 01:47:28 2017] [error] [client 168.235.207.88] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/grand-theft-auto-san-andreas-apk-download/
[Thu Mar 16 01:46:12 2017] [error] [client 8.37.225.163] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/utorrent-pro-apk-download/
[Thu Mar 16 01:44:11 2017] [error] [client 103.9.114.238] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://www.google.com.bd/search?ei=YjPKWOvgAYH0vAT9jLh4&q=grand+theft+auto+vice+city+free+apk&oq=grand+theft+auto+vice+city+free+apk&gs_l=mobile-gws-serp.12..0i19k1j0i22i30i19k1l4.1915.22156.0.23116.17.8.0.9.9.0.870.2372.2-5j1j6-1.7.15141….0…1c.1j5.64.mobile-gws-serp..1.16.2775…41.Phr5DJXKEvE
[Thu Mar 16 01:44:10 2017] [error] [client 137.59.87.46] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/grand-theft-auto-san-andreas-apk-download/
[Thu Mar 16 01:44:08 2017] [error] [client 168.235.196.58] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/utorrent-pro-apk-download/
[Thu Mar 16 01:39:22 2017] [error] [client 213.140.203.170] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://www.google.com.cy/
[Thu Mar 16 01:35:38 2017] [error] [client 107.167.103.240] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://www.google.com.br/search?q=poweramp+apk+installer&client=ms-opera-mini-android&hl=pt-BR&sa=X&as_q=&spell=1&ved=0ahUKEwi94o-MtNrSAhUC52MKHc0JBUsQBQgKKAA
[Thu Mar 16 01:18:02 2017] [error] [client 2405:205:4200:364e:3395:cbf3:4833:c3a] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://www.google.co.in/search?site=webhp&ei=ZS3KWILfCYK20ASq87aoDw&q=8+ball+pool+3.8.6+mod+apk+download+not+mega&oq=8+ball+pool+3.8.6+mod+apk+download+not+mega&gs_l=mobile-gws-serp.3…160708.169771.0.171575.9.9.0.0.0.0.581.3609.2-3j2j2j2.9.0….0…1c.1.64.mobile-gws-serp..0.8.3331…33i22i29i30k1j33i160k1j33i21k1.EPtM60olZa4
[Thu Mar 16 01:18:01 2017] [error] [client 52.23.217.36] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”
[Thu Mar 16 01:13:51 2017] [error] [client 2405:204:200b:c0f8:19a5:d9d:5900:8e82] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/wp-admin/admin.php”, referer: https://apkset.com/wp-admin/about.php
[Thu Mar 16 01:13:12 2017] [error] [client 8.37.225.174] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/grand-theft-auto-vice-city-apk-free-download/
[Thu Mar 16 01:03:56 2017] [error] [client 8.37.231.74] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/jio4gvoice-apk-download/
[Thu Mar 16 01:03:56 2017] [error] [client 8.37.231.74] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/jio4gvoice-apk-download/
[Thu Mar 16 01:02:57 2017] [error] [client 2600:3c03::f03c:91ff:fe08:79c3] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://www.androidswift.net/feed/
[Thu Mar 16 01:02:57 2017] [error] [client 168.235.197.94] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/google-play-games-apk-download/
[Thu Mar 16 01:02:44 2017] [error] [client 168.235.197.156] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/jio4gvoice-apk-download/
[Thu Mar 16 01:00:29 2017] [error] [client 2405:204:200b:c0f8:19a5:d9d:5900:8e82] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/osdesire.net/wp-admin/admin-ajax.php”, referer: https://osdesire.net/wp-admin/
[Thu Mar 16 01:00:27 2017] [error] [client 8.37.225.44] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/link2sd-plus-apk/
[Thu Mar 16 00:19:07 2017] [error] [client 79.121.15.130] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://www.google.hu/
[Thu Mar 16 00:18:29 2017] [error] [client 168.235.207.21] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/grand-theft-auto-vice-city-apk-free-download/
[Wed Mar 15 23:51:19 2017] [error] [client 2405:205:8385:321:4f7:150c:8646:74b1] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://www.google.co.in/search?site=webhp&ei=NhnKWKf-MseV8wWjtbXYBg&q=link2sd+plus+apk&oq=link2&gs_l=mobile-gws-serp.1.1.0i67k1l2j0l2j0i67k1.58080.67212.0.68612.18.10.1.3.3.0.684.2991.2-1j3j1j2.7.0….0…1c.1.64.mobile-gws-serp..12.6.1452.3..41.tpmbqZxYh7U
[Wed Mar 15 23:41:35 2017] [error] [client 8.37.237.138] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/jio4gvoice-apk-download/
[Wed Mar 15 23:34:47 2017] [error] [client 5.36.193.129] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”
[Wed Mar 15 23:16:49 2017] [error] [client 202.62.17.155] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://www.google.com/
[Wed Mar 15 22:47:06 2017] [error] [client 115.178.209.150] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/droidfedo.net/index.php”, referer: https://www.droidfedo.net/mx-player-pro-apk-free-download/
[Wed Mar 15 22:47:05 2017] [error] [client 8.37.225.190] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://www.google.co.in/search?ie=ISO-8859-1&q=download+jio+voice+4g+latest+app+vertion&btnG=Search
[Wed Mar 15 22:43:22 2017] [error] [client 2405:205:3000:3aaa::fde:a4] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://www.google.co.in/search?q=download+gta+vice+city+apk&oq=download+gta+&aqs=mobile-gws-lite.2.0l5
[Wed Mar 15 22:29:26 2017] [error] [client 107.167.109.24] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://www.google.co.in/search?q=utorrent+pro+apk&client=ms-opera-mini-android&channel=new&gws_rd=cr&ei=gQbKWNOnLaHHjwThirmYAg
[Wed Mar 15 22:24:31 2017] [error] [client 8.37.231.186] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/sd-maid-pro-unlocker-apk/
[Wed Mar 15 22:18:22 2017] [error] [client 66.102.6.213] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”
[Wed Mar 15 22:18:21 2017] [error] [client 8.37.225.210] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/du-battery-saver-pro-apk-latest-version-download/
[Wed Mar 15 22:18:21 2017] [error] [client 197.252.4.186] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://www.google.com/search?hl=ar&q=u+torrent+pro+apk
[Wed Mar 15 22:14:14 2017] [error] [client 123.200.4.26] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”
[Wed Mar 15 21:58:47 2017] [error] [client 114.120.233.221] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/wp-content/uploads/2016/04/logo-facebook.png
[Wed Mar 15 21:46:24 2017] [error] [client 8.37.231.87] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://apkset.com/grand-theft-auto-vice-city-apk-free-download/
[Wed Mar 15 21:44:52 2017] [error] [client 197.226.48.68] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://www.google.mu/
[Wed Mar 15 21:40:56 2017] [error] [client 2600:3c03::f03c:91ff:fe08:7a05] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”, referer: https://www.androidswift.net/feed/
[Wed Mar 15 21:36:28 2017] [error] [client 2405:204:6587:4672:374e:2844:a41a:9baf] SoftException in Application.cpp:641: Could not execute script “/home4/a7v5m0d7/public_html/apkset.com/index.php”