Error in web application

Error in web application

#0 Uncaught exception 'ErrorException', with message 'file_put_contents(): Only 0 of 41 bytes written, possibly out of free disk space' in logger.php:50

Stack trace:
#0 >>> logger.php(50)
#1 ^ (): error_handler(integer, string, string, integer, array)
#2 ^ logger.php(50): file_put_contents(string, string, integer)
#3 ^ Request.php(271): __construct(string, string, string, string)
#4 ^ Request.php(45): logResourceRequested(string, string, array)
#5 ^ ajax.php(69): __construct(boolean, object) 
'From' address is not a string data type..