How to remove this error? 4.15
When you click on the Magnifying glass, does it take to you the offending node that is causing the error? If it is a Cast - it may be failing - puttin in another node to catch the fail will remove the error if that is it. Also if you are calling something that does not exist yet (like a BP class that might be added later to the level, but isnt there yet, you will get these types of errors - you can use an IS VALID to test if the item exists first, before the next node. Hope that helps.
Jerry