Error when saving a recorded web monitor

I received an error when recording several web monitor sessions - "Array index out of bounds. Cannot fetch element with index=0 (Collection size=0)"

In each instance, the recorded session verified and tested, but would not save. In each of my recorded sessions, parts of the URL contained curly braces ('{' and '}'). By replacing any occurence of the curly braces with their corresponding escape sequences I was able to save and run the web monitor.

'{' = %7b
'}' = %7d

Jeff