What does "The compiler is unable to type-check this expression in reasonable time; try breaking up the expression into distinct sub-expressions" mean?

Please, copy the code where the error occurs, that will be faster for those who read. We cannot go to your local url (anyway, I probably wouldn't for security reasons).

Or paste the image in the post.

That happened to me today and in my case it was obvious. I was attempting to join a large number of String Variables together to create one. I figured a solution was to break the process up into smaller chunks and then join the chunks together. The above error disappeared, hopefully never to return!

Regards

Guy MacDonald