Update Failed Version 2.1.4 to 2.1.5

Hello Sir,

First of all thank you for making this useful plugins and it works really well on my site. But yesterday i found out the update to version 2.1.5 and when i’m trying to update my plugin its show Failed sign [Update Failed: The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions].

Before this i have no issues at all when updating Social Media and Share Icons (Ultimate Social Media) on my site. Please show me some guide what should i do? Is it because of my site or the plugins itself? Please make it update with all WP version, and currently i’m using WP 4.7.5 and the plugin i used is version 2.1.4 no issues at all…i can share to my Facebook and Twitter easier..

Thank you Sir.