“Pending payment”—it cannot be paid for

Hi,
I am using wordpress latest version and woocommerce latest version plugins. i also using flatsome premium theme latest version. my customer trying to place order but she/he seeing the message below once clicked on “Place order” button.

This order’s status is “Pending payment”—it cannot be paid for. Please contact us if you need assistance.

I have copied my WC system status it following-

### WordPress Environment ###

Home URL: https://www.moumita.net
Site URL: https://www.moumita.net
WC Version: 3.0.3
Log Directory Writable: ?
WP Version: 4.7.3
WP Multisite: –
WP Memory Limit: 256 MB
WP Debug Mode: –
WP Cron: ?
Language: en_US

### Server Environment ###

Server Info: Apache
PHP Version: ? 5.4.45 - We recommend a minimum PHP version of 5.6. See: How to update your PHP version
PHP Post Max Size: 32 MB
PHP Time Limit: 30
PHP Max Input Vars: 1000
cURL Version: 7.36.0
OpenSSL/1.0.1e

SUHOSIN Installed: –
Max Upload Size: 32 MB
Default Timezone is UTC: ?
fsockopen/cURL: ?
SoapClient: ?
DOMDocument: ?
GZip: ?
Multibyte String: ?
Remote Post: ?
Remote Get: ?
WCS_DEBUG: ?  No
Subscriptions Mode: ?  Live

### Database ###

WC Database Version: 2.6.14
WC Database Prefix: wp_
woocommerce_sessions: ?
woocommerce_api_keys: ?
woocommerce_attribute_taxonomies: ?
woocommerce_downloadable_product_permissions: ?
woocommerce_order_items: ?
woocommerce_order_itemmeta: ?
woocommerce_tax_rates: ?
woocommerce_tax_rate_locations: ?
woocommerce_shipping_zones: ?
woocommerce_shipping_zone_locations: ?
woocommerce_shipping_zone_methods: ?
woocommerce_payment_tokens: ?
woocommerce_payment_tokenmeta: ?
MaxMind GeoIP Database: ?

### Security ###

Secure connection (HTTPS): ?
Hide errors from visitors: ?

### Active Plugins (29) ###

Ultimate Addons for Visual Composer: by Brainstorm Force – 3.16.1
WooCommerce Review for Discount: by 75nineteen Media – 1.6.1
Downgrade: by GraphicEdit – 1.0.0
WooCommerce EasyPayWay A Bangladeshi Payment Gateway: by Jm Redwan – 1.4.0
WP Hide Plugin Updates and Warnings: by Midland Web Company – 1.0
Jetpack by WordPress.com: by Automattic – 4.8.2
WPBakery Visual Composer: by Michael M - WPBakery.com – 5.1.1
Newsletter: by Stefano Lissa & The Newsletter Team – 4.8.9
Really Simple SSL: by Rogier Lankhorst – 2.5.11
Regenerate Thumbnails: by Alex Mills (Viper007Bond) – 2.2.6
Related Posts via Taxonomies: by alphasis – 1.0.1
Revolution Slider: by ThemePunch – 5.1
SendPress Newsletters: by SendPress – 1.8.3.30
Tawk.to Live Chat: by Tawkto – 0.2.5
Theme My Login: by Jeff Farthing – 6.4.9
WooCommerce Account Funds: by WooThemes – 2.0.11 – 2.1.4 is available
WooCommerce Multilingual: by OnTheGoSystems – 4.1.2
WooCommerce PDF Invoices & Packing Slips: by Ewout Fernhout – 1.6.5
WooCommerce Product Fees: by Caleb Burks – 1.2
Woocommerce Payment Gateway Per Product: by Dreamfox Media – 1.2.6
WooCommerce Subscriptions: by Prospress Inc. – 1.5.29 – 2.2.4 is available
WooCommerce: by Automattic – 3.0.3
Follow-Up Emails: by 75nineteen Media LLC – 3.6.7
Yoast SEO: by Team Yoast – 4.6
WP Fastest Cache: by Emre Vona – 0.8.6.8
WP Smush: by WPMU DEV – 2.6.2
YITH WooCommerce Ajax Search: by YITHEMES – 1.5.2
YITH WooCommerce Anti-Fraud: by YITHEMES – 1.1.0
YITH WooCommerce Custom Order Status: by YITHEMES – 1.1.0

### Settings ###

API Enabled: ?
Force SSL: ?
Currency: USD ($)
Currency Position: left
Thousand Separator: ,
Decimal Separator: .
Number of Decimals: 2
Taxonomies: Product Types: deposit (deposit)
external (external)
grouped (grouped)
simple (simple)
subscription (subscription)
variable (variable)
variable-subscription (variable-subscription)

Taxonomies: Product Visibility: exclude-from-catalog (exclude-from-catalog)
exclude-from-search (exclude-from-search)
featured (featured)
outofstock (outofstock)
rated-1 (rated-1)
rated-2 (rated-2)
rated-3 (rated-3)
rated-4 (rated-4)
rated-5 (rated-5)

### WC Pages ###

Shop base: #4179 - /shop/
Cart: #1906 - /shopping-cart/
Checkout: #1907 - /checkout/
My account: #1908 - /my-account/

### Theme ###

Name: Flatsome
Version: 3.3.4
Author URL: https://www.uxthemes.com/
Child Theme: ? – If you're modifying WooCommerce on a parent theme you didn't build personally
then we recommend using a child theme. See: How to create a child theme

WooCommerce Support: ?

### Templates ###

Overrides: flatsome/woocommerce/archive-product.php
flatsome/woocommerce/cart/cart-empty.php
flatsome/woocommerce/cart/cart.php
flatsome/woocommerce/checkout/form-checkout.php
flatsome/woocommerce/checkout/form-coupon.php
flatsome/woocommerce/checkout/thankyou.php
flatsome/woocommerce/content-product.php
flatsome/woocommerce/content-product_cat.php
flatsome/woocommerce/content-single-product.php
flatsome/woocommerce/global/breadcrumb.php
flatsome/woocommerce/global/quantity-input.php
flatsome/woocommerce/global/wrapper-end.php
flatsome/woocommerce/global/wrapper-start.php
flatsome/woocommerce/loop/loop-end.php
flatsome/woocommerce/loop/loop-start.php
flatsome/woocommerce/loop/orderby.php
flatsome/woocommerce/loop/pagination.php
flatsome/woocommerce/loop/result-count.php
flatsome/woocommerce/loop/sale-flash.php
flatsome/woocommerce/myaccount/form-login.php
flatsome/woocommerce/myaccount/navigation.php
flatsome/woocommerce/notices/error.php
flatsome/woocommerce/notices/notice.php
flatsome/woocommerce/notices/success.php
flatsome/woocommerce/product-searchform.php
flatsome/woocommerce/single-product/photoswipe.php
flatsome/woocommerce/single-product/price.php
flatsome/woocommerce/single-product/product-image.php
flatsome/woocommerce/single-product/product-thumbnails.php
flatsome/woocommerce/single-product/related.php
flatsome/woocommerce/single-product/review.php
flatsome/woocommerce/single-product/sale-flash.php
flatsome/woocommerce/single-product/share.php
flatsome/woocommerce/single-product/short-description.php
flatsome/woocommerce/single-product/tabs/tabs.php
flatsome/woocommerce/single-product/title.php
flatsome/woocommerce/single-product/up-sells.php
flatsome/woocommerce/single-product-reviews.php
flatsome/woocommerce/single-product.php

My website URL Is https://www.moumita.net/

Can someone please help me how to fix it?
Thanks.