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Hi!
At first I fixed issue that described here - https://www.gavick.com/blog/how-to-fix- ... virtuemart

Now:

Hi

Please tell me the url to the page this occurred and rise error showing level to maximum, so the acctual error will be revealed. You may need to rise it on php.ini as well or check error.log

I have the same error. What could I do?

Hi

It may be lots of things. Please rise error showing level to maximum or look at server logs to see what is this error exactly.

Hi

It may be lots of things. Please rise error showing level to maximum

Sorry I can't get exactly what that means.

Hi

Please go to joomla global configuration and set error showing level to "development" if this will not reveal the error rise it in php.ini file on Your server. Or check error logs for this site, look for fatal error messages.