Hi,
I found lots of discussions about this problem for this module, but none of them was same with my problem.
I have installed inStyle template and configure the virtuemart for multilingual shop one of them is en-US and the second one is fa-IR where fa-IR is default shop. The problem is that when I set the data source on Virtuemart Categories it shows me the error "VirtueMart is not installed or any VirtueMart categories are available (current language: en_us)" my shop is working accurately and I don't know why it says the categories are not available.