Cannot generate time sheet

Cannot generate time sheet

We are doing a demo of ServiceDesk Plus MSP and cannot get time sheets to generate either in our installed demo or the online demo.  We enter worklog and time but when we go to generate the time sheet it says "Operation Not Allowed Due to Invalid Time Period".  

How do we get around this?  None of the other features we want to test can be tested as we cannot get a time sheet to generate no matter how we enter the data.  We cannot get weekly or daily time sheets to generate.  

We have a support request open with the evaluation team but no one seems to know. It seems a core function of the MPS product to generate the time sheet.  Does anyone know what we are missing?
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