PMS 1.23.1.4602 Error

[lomaxi72]

Server Version#: 1.23.1.4602
Hardware version: NAS Wd MyCloudEx2Ultra

I updated PMS to the version above on my WD Ex2Ultra. After that, I cannot acces to my media server and when I click on Settings in the Plex section, I have the error

Not Found

The requested URL was not found on this server.

I tried to donwgrade to the previous version of PMS, but it doesn’t work. I still have that error when I tried to enter in settings of PMS on the NAS. And also the library was not available.
How could I solve the problem?

[mheckman0142_msn_com]

The same happened on my TrueNAS in jail. I had to revert to old version to get it working right. Must be an issue with update.

[lomaxi72]

I tried to revert to old versione, but it didn’t work for me. I cannot use PMS at all