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I got the same message yesterday. Have a MacBook Pro running MacOS10.14. Spoke with an excellent Apple rep who thoroughly checked my settings and tried numerous fixes. Unfortunately nothing worked. It was suggested that I reinstall my operating system which right now is Mojave.

Same as everyone else here. Two separate computers with the same exact issue. They were both updated to Mojave within the last 5 days. Was hoping to update to Logic 10.5, but I'm not able to do anything in the App Store. I've spent way too much time on the phone/chat with Apple support over the last 24 hours. I have a case open as well, and sent them data from my computer. The rep said she would call me back in a few days (Monday). Not sure what that means.

Just spent a couple of hours with Apple. They don't know what's going on. They ran a diagnostic on my computer and now I have to wait to see what comes up. A note, this was happening even before I upgraded to 10.14.6, so I'm sure it's not the update. But everything seems to be off kilt anyways, not really sure what's going on. Don't want to upgrade to Catalina, too many issues with music programs and the whole 32 bit thing. I hope they fix this soon.

Now that I have met a bunch of Mojave Logic users. Do any of you guys use Native Instruments FM8? The plugin validator fails every time I attempt to validate it. That is why I am re-downloading Logic, in hopes that this will fix my issue.

I tried clearing the cache, certs, signing in and out, both Macs are having issues. tried everything. i hope they fix it. we need our apps !!!

i thought i was going crazy. i was about to reset my whole mac for this lol

The same problem!!! Mojave

I don't like Catalina

i do like catalina but on this machine i have a 32 bit app that is not compatibe so i need a solution for mojave

Exactly my issue. I am a music producer too. Too many third party developer issues with Catalina at the moment.

@rdfmusic did apple support help at all?

Hi still on to them ... the rep said he believed they were close to a solution ... here's hoping !

I hope the resolve this soon, I thought I was the only one. I already restored MacOS and it didn't help.

You're not alone bro. I went back 8 week via Time Machine.

MBA (Late 2017) on Mojave 10.14.6

did that make any difference?

Same here, using Mojave. Hope this gets fixed soon.