This can happen when there is an add-in conflict.
Open Excel, open a blank workbook, go to File (top left), Options, Add-ins, switch the drop down at the bottom the of window to COM add-ins, and disable (uncheck all the boxes) everything there, including the Analytic Solver COM Add-in if it is available, and click OK. Once this is done follow the steps available here for registering only the Analytic Solver Platform add-in. Once this is done reopen Excel.
If the problem persists please feel free to contact us at support@solver.com.
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