Hi everyone,
The matter is that a process model that was working fine, suddenly shows the notification "process model is not valid" when open the process model, but it doesn't show more info about it. I'm pretty sure about it happened because we have modified some rules and interfaces, but this is a large process.
So, is there any way to take a log of the validation process to get the bug?
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In Designer, bring up a list of all of that process model's Dependents. Then, in order of Last Modified, go through any Expression Rules and Interfaces, and check for any items that were saved in an invalid state (like throwing an error by default or saved with a syntax error that immediately displays in the rule editor window). That's your most likely source, as far as I can tell.
Agree with Mike, I only see this error when an interface is throwing an error itself - start there.