RDS- Not in the list of authorized Apps

This is on Server 2012 R2

I have three servers setup for RDS-

Applications-RD CB, RD WA, RD GW

Applications01-RD Session Host

Application02-RD Session Host

Applications01 and Applications02 have different applications installed and when i try to access them at the same time the server which hold the application that wasn't opened first would come up with the message when trying to open an application:

"The following RemoteApp program is not in the list of authorized programs: Appname "

Is this a issue with the way the RDS or is this associated with another issue? If anyone could spread some knowledge it would be appreciated.