I'm having the exact same problem that was discussed in this thread:
https://jazz.net/forum/questions/81670/rtc-error-after-advisor-deployment

It was caused like this:

1. Deploy the advisor extension plugin by copying the .ini-file to server\conf\ccm\provision_profiles and adding my site-folder in \server\conf\ccm\sites\
2. Request server reset with this URL: <host>/ccm/admin?internal#action=com.ibm.team.repository.admin.serverReset
3. Advisor plugin couldn't deploy properly for some reason
4. Delete all files that were added in point 1.
5. Restart WebSphere
6. CCM does not deploy.
   

I got CCM working again with a freak accident. I still had the server reset url open in my Firefox tab. I clicked it even though I couldn't access anything inside CCM. It told me that the following file was missing:

<WebSphere-location>AppServer\profiles\AppSrv01\temp\<node-name>\server1\ccm.war\ccm.war\built-on.txt

I just copied the built-on.txt file from the jts.war\ folder to the ccm.war\ folder and clicked again on the "Request Server Reset" button. After restarting WebSphere once again it worked all of a sudden.

My observations:
It seems that all it really needed to work again was a fresh server restart request. But since you can't reach the server request button it is effectively a deadlock situation (or can you skip this step after providing the built-on.txt?).

Isn't there a way to request a server restart for ccm without having to access ccm directly?