Interesting enough I can’t reproduce the error now. I could not get rid of Fatal error for several days and now its gone! It could have been settings on the server of who knows!
Thanks to everyone that tried to help me.
@trepidationcouk the ‘old’ line does not exist in DataStore.php file in my installation.
Any other ideas?
I am having the same problem, the line 738 is edited as suggested and I am still getting the same error.
Can someone help please?