looks like CDB is locked. (By some application?) Did you look into ConfD devel.log and confd.log?
There may be some indication which application locked the CDB.
Are there any steps to reproduce the issue? Is it reproducible with one of the example application supplied with ConfD, or is it reproducible only in your application/environment?
did you try to reproduce with one of examples supplied with ConfD.
I assume this is related to your application. Since there is no information in the devel.log, confd.log, I suggest your open RT ticket and provide error logs so ConfD developers can examine internal calls. The error logs can be enabled in confd.conf- element /confdConfig/logs/errorLog (see man page for confd.conf or ConfD User Guide).