In *iTest*, a previously-working test case was failing a test step in a *Spirent TestCenter CLI* session. **STEP:** command stc1 source project://.tcl **ERROR:** RuntimeError in perform: There were 1 validation error(s); aborting apply. License Check failed Failed to source TCL file
**WORK AROUND:** Reboot your port groups. I did this from within *Spirent TestCenter Application* menu: 1. From the menu, click **Tools/Equipment Information...** 2. Make sure the desired chassis is highlighted and click on the [**Port Group**] tab. 3. Click on the port group, then right-click and select **Reboot Port Group**.