Error after click to Manufacturer

[Pekkonen]

Hello, I have a little problem with Manufacturer in FrontEnd.
When SEF desabled - all working properly and link goes to:
/index.php?option=com_virtuemart&view=category&virtuemart_manufacturer_id=3&lang=it
But after enable embedded SEF I can see instead manufacturer page error:

Code Select Expand

Fatal error: Class 'vmCustomPlugin' not found in myaccount/plugins/vmcustom/textinput/textinput.php on line 24
PS I using VM 1.9.8m
Joomla! 1.7.5