VIAVI TestCenter-Automation: RuntimeError in perform: unable to create unknown command "ChassisConnectCommand"

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When running script below errors are observed are observed on console RuntimeError in perform: unable to create unknown command  "ChassisConnectCommand"     while executing "stc_int::salPerform $commandName $args "     (procedure "stc::perform" line 2)     invoked from within "stc::perform ChassisConnectCommand -HostName $ChassisIP"     (file "Get_Chassis_Mod_Info.tcl" line 8) The scripts were running successfully on older Spirent TestCenter version like 4.33, but after upgrading the to Spirent TestCenter version 4.39 the Errors are observed.
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