Warning: set_time_limit():

Hello

I installed the export/import mod by JNeuhoff
I'm facing following problem when i click on export button in Opencart 1.5.1.x

Warning: set_time_limit(): Cannot set time limit due to system policy in /customers/1/8/c/xxxxxx/httpd.www/admin/controller/tool/export.php on line 76ÐÏࡱá;þÿ

Is there someone who can help me to find a solution to this problem?

Best regards

Geert