Template Problem

[hajduluk]

PS 1.7.6.7

Hello, 

I probably have a problem with the template. Only in Backoffice > Products. None of the products can be edited or created. 

Can anybody help me please?

Thank you so much.

[juanrojas]

hello, what version of php do you have? is this problem recent? Could it be that you installed something or did you do an update?

[hajduluk]

PHP v 7.4.X

 

I tried to upgrade to the newest PS version, but it failed and I just restored the previous backup. 

[juanrojas]

that is to say that before updating it worked for you? try clearing the cache via ftp

and downgrade to php 7.2

[hajduluk]

What files do I have to delete? 

And I just tried to downgrade to 7.3 (only 7.3 and 7.4 are available)

[juanrojas]

delete var>cache

[hajduluk]

I think yes. I have changed some of the template files just to make the logo as a GIF file. But I don't know what files I changed. It was two months ago. Maybe reinstalling the "classic" template can help?