Hi Ergin,
I don't think that the error you are seeing here in the RTMT log is corresponding to the issue that the users are facing.
As per your problem, users when put on hold, do not hear the MOH correctly right?
This sounds more like an audio quality problem.
Does this happen only during certain times of the day? What is the frequency of reporting this issue? Is this a continuous problem or intermittent?
You can take packet captures on the MOH server to check if the servers are playing the moh stream correctly. In this case it is the network that has to be investigated for a problem.