An unexpected error occurred. Unable to find the specified page.

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Hello guys!
I'm new to Concrete5.

I just migrated from WordPress to Concrete5 recently.

I have a problem that I couldn't find any solution on the web.
When I try to save a block with HTML code on it I get the following message "ERROR: An unexpected error occurred. Unable to find the specified page." and after that, I must refresh the page in order to continue editing.

Why does this happens? I'm using PHP 7.4
This only happens when I try to insert HTML tags using the HTML block format.

Any help is greatly appreciated!
I'm using the latest Concrete5 version and PHP 7.4

mortaza
 
stewblack23 replied on at Permalink Reply
stewblack23
I suggest start with a process of elimination. Start with seeing if their are any javascript errors in the console using Chrome Developer tools. If there are no console errors, look at the PHP logs on the server and see if anything is weird. Also try different PHP versions and see if there are any issues.
JohntheFish replied on at Permalink Reply
JohntheFish
Check the core version you are using is php7.4 compatible.

What kind of code are you trying to add to what type of block?