SOLVED:VirtueMart 3.6.11 10289 - mError: Could not find product by language

[lostmail]

Installed the BETA:
http://dev.virtuemart.net/attachments/1248/com_virtuemart.3.6.11.10289_package_or_extract.zip

Now i get this strange error message in frontend (Custom Template = Horme3):

vmError: Could not find product by language

In the installation with default templates this error message is not visible.

What is to adjust here to avoid the error message ?

Thank you.

UPDATE:
Installed it again on previous system and not the error message is gone...