Power BI import of Excel WB with Power View

[isolarem]

I tried to import Excel Workbook content into Power BI Desktop - all my data model tables and queries were imported. However my Power View sheets were not imported instead the "Migration completed" box displays in the power view section - "Power View Sheets (0 items) despite the fact that I have Power view sheets in my excel work book. Please can anyone advise on what could be the cause of this issue?