MyBB Internal Error

MyBB has experienced an internal error and cannot continue.

Error Type:
Catchable Fatal Error (4096)
Error Message:
Object of class MyLanguage could not be converted to string
Location:
File: Buttons_Icons/buttonincludes.php
Line: 318
Backtrace:
File Line Function
/inc/class_error.php 171 errorHandler->output_error
/Buttons_Icons/buttonincludes.php 318 errorHandler->error
/Buttons_Icons/previous.php 68 require