ErrorException in Command.php line 38: Undefined variable: outputLines

[congloi]

I used this package few month ago, all was going ok. but today, get error

ErrorException in Command.php line 38:
Undefined variable: outputLines

line 38 is: exec($command, $outputLines, $result);

help me check, I don't know why, I don't edit or do anything in my server.

my version is 1.1, using pngquant to optimized

[tomopongrac]

I know that you write that you dont change anything on your server but check in your php.ini file do you have exec function disabled (exec function must be enabled).

[psliwa]

From 1.2.2 version I made clear error message when exec function is disabled.