Error: [8192] rtrim(): Passing null to parameter #1 ($string) of type string is deprecated

Warning: file_put_contents(/home/rahisico/pcsdemo.rahisi.co.tz/logs/mx_error.txt): Failed to open stream: No such file or directory in /home/rahisico/pcsdemo.rahisi.co.tz/libs/Log.php on line 42
{"title":8192,"msg":"Oh no this is embarassing...","sub":"We seem to have a problem, please try again later."}