If you have more than one Symphony version installed, you may be trying to run a different symping than the one on the Platform Management Console, or you may be trying to submit symping workload to the wrong cluster.
Open a command console that points to the correct Symphony cluster.
From the Start menu, select Programs > Platform Computing > Symphony version_number > Symphony version_number Command Prompt.
Run symping from the command prompt. By setting the correct environment, you will automatically use the correct version of symping.