Matlab Onscale Toolbox

Dear all, 

I am a beginner user of the Matlab toolbox for Onscale

When I  start to run matlab toolbox examples (F.example: Build_and_Run_a_General_Model.m )  I am continuously receiving the ERROR message :

Progress: This is a Submit job
{
"errorCode": 400,
"errorMessage": "There was an error generating a job id.",
"errorTitle": "Job Id Error"
}

Progress: success.
OnScaleCLI Successfully Exited.
Error using Job/submitJob (line 1932)
"errorMessage": "There was an error generating a job id.",
Error in Build_and_Run_a_General_Model (line 119)
myJob.submitJob();