Error communicating with the server

[Akhil John]

Error: 500

ERROR - Exception "javax.el.ELException: Error reading [explorer] on type [com.atlassian.crucible.actions.create.EditChangelogAction]" (javax.servlet.ServletException) while processing

Getting this error when trying to create a review.

crucible version
CR4.8.7 FE4.8.7