The top error in your errors list will often be a Script error:
While Error analysis surfaces these errors and shows you their impact, it cannot always locate the exact code lines containing Script errors or provide Session replay. Why? Because script error origins are usually concealed and would need to be unmasked for this information to become available.
Learn how to unmask Script errors here.
What is a Script error?
Script errors are very common and happen due to issues with users' browsers or operating systems being unable to load the script. Commonly, the error is in a script that is hosted on a different domain, port, or protocol. Browsers function to hide errors originating from script files with different origins for security reasons.
You might be familiar with this message browsers send to the onerror callback when an error originates from a JavaScript file served from a different origin:
Script error.
Why are Script errors difficult to fix?
While you are being alerted to the error, it is not possible to know what the error exactly is or the code it is originating from. Often the code itself is not incorrect, however, the instructions from the script cannot be executed correctly. It could just be a security application treating the script as a security threat.