RPT is unable to execute a schedule because one of the ports(%1) it uses to communicate with the agents has been taken by another RPT(or other server) process. Ensure only one RPT instance is running.
Typically, this error occurs when a server process on the workbench computer is listening on the same port that HCL OneTest™ Performance requires. This error can also occur when two instances of HCL OneTest™ Performance run on the same workbench.
Identify and stop the other process or service on the workbench that is using the ports that HCL OneTest™ Performance requires. Restart HCL OneTest™ Performance. You can also change the ports that HCL OneTest™ Performance uses by configuring the workbench and all agent computers. To change the ports, click Window > Preferences > Test > Server, and click Preferences > Test > Performance Test Reports > Web Reports.