My team found error in file Export_helper.php at Get size of integer part function
Line 2140

Old code is
$maxIntegerLen=max([$integerMaxLen,$integerMinLen]);

New code after debug mode and correct
$maxIntegerLen=max(array($integerMaxLen, $integerMinLen));

In which version of LS did you find this error?

If you found it in LS 3.0.0, please note that this version requires PHP 5.5.9 at least (which supports short-hand notation for arrays).

Sorry for missing Version is 2.72.4+171110

OK, sorry to say we don't fix bugs in 2.7x anymore, since it has been replaced by 3.0.0. But in your case the fix is easy: Update PHP to 5.5.9 or later.