Groovy error:A Method called by the script failed on Line:30 with error:Error Occurred:UNAUTHORIZED

Summary:

I am running a groovy script in EPM FCCS and getting error "Groovy error : A Method called by the script failed on Line:30 with error : Error Occurred : UNAUTHORIZED"

REST connection i created using my user credential , which have full access to application.

Dint see any errors / Validation issues when i run Groovy script Validator.

Below is the code

// Use Substitution Variables for Start and End periods
def StartPer = operation.application.getSubstitutionVariableValue("PipelineStartPeriod")
def EndPer = operation.application.getSubstitutionVariableValue("PipelineEndPeriod")

println("StartPer = $StartPer")
println("EndPer = $EndPer")

// Define Pipeline and variables to run

HttpResponse<String> jsonResp = operation.application.getConnection("TEST1").post("/aif/rest/V1/jobs")