Cannot read attribute property of undefined "Entity Structure"

After I created a Business Process, somehow it caused my custom page "Concert Programs" to lose the list of values/records and they no longer display.  I deleted the process hoping this would fix it, but have not been able to fix the issue.  My custom page gets the error in the screenshot. (Cannot read "attribute" property of undefined) .  I investigated the code which I also have a screenshot and it appears my custom entity "UsrConcertPrograms" is missing from the list.  Can you point me in the direction to resolve?  Thank you.

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Dear Darlene, 


If it is dev environment or you don't have any important data created after the issue occurred, probably the best and the fastest option would be to roll back to the backup made before the issue occurred (if the site is in cloud the backups are made daily, if you have on-site installation it depends on your configuration). If rolling back is not an option for you, you can try to generate the source code for all and compile all in configuration, it may help. If the issue would still occur after that, the issue needs to be debugged to fix it:

As you've mentioned that your custom entity is missing most likely it is either removed completely and in this case, you can try to recreate it. Also, one of the possibilities is that the corresponding SysModule record was removed, In this case, you can restore it following the steps in the community article below (please note that most likely SysModuleEntity and SysModuleEdit records still exist, however they may have been removed as well):

If you would need help with this please contact support at because it is hard to tell the exact root cause in your case without debugging the issue.

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