Either the configuration of the validator you have put on the transition is bad, or you've got an incompatible or buggy version of the JSU
First, check "manage add-ons" for the JSU version and check that it's valid for your version of JIRA.
Second, take a look at the validator config - they usual way to break one is to set up a simple check like "field xyz must be filled in" and then delete or make-unavailable field xyz. Sometimes, you get a polite message, but often a crash.
In the second case, or if it's neither of them, try removing the validator completely, and then re-adding it.
What was the result when you removed the validator (and did not re-add it)?
Then, after you added it back, what Exactly was the config of the validator and what type of field(s) did you point it at?
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When i removed it. it works well cause there're no other restrictions.
After re-add it, it breaks with same error message.
The type of fields are custom fields(Date Picker and User Picker(single user))
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Ok, it's definitely the validator then. What exactly is the config of the validator?
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Ok, you have done everything right here, so I'm pretty sure you have found a bug in the JSU.
There's one last test I'd like you to do - split the validator. Set the existing one to validate on the user picker and then add a completely new validator (of the same type) to look at the date.
Does that work, or does it crash on one or both validators?
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No problem. Next thing to look at is the versions of Java, JIRA and the JSU you are on.
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Ah, well, that answers it.
Your JSU version is not compatible with 7.2.3. See https://marketplace.atlassian.com/plugins/com.googlecode.jira-suite-utilities/versions
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