You have hit a safety feature to not allow large numbers of dynamically provisioned VMs to be allocated at one time %1. Use eclipse.ini VM argument -DrptMaxAgentsVMs={#} to override this setting.
Explanation
The maximum number of dynamically provisioned agents has been reached.
System action
The test run is aborted.
User response
Edit the SDP/eclipse.ini and SDP/rptse/eclipse.ini to include a larger -DrptMaxAgentsVMs={#}