RPTI0021E - Local computer is not running the Agent Controller.
To run tests, run the Agent Controller on the workbench computer, even if no agent computers are used.
The test run does not start.
Fix
Start the Agent Controller on the workbench.
On Windows, open a command window...
Start | Run | cmd | OK
...and run...
net start "Rational Agent Controller"
On Linux, run...
cd /opt/IBM/SDP/AgentController/bin
./RAStart.sh