This error indicates the PowerShell can't connect to your defined variable for PolicyStore in your EPM_EnterpriseEvaluation_412.ps1 file. If you open the file you will see that you need to define the server where the output database exists along with the policies that will be used for evaluation. Your command is running against your EPBM_TEST CMS group and is filtering by the Policy Category Database that you must have defined for your policies. Hope this helps.
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