Run Time Error '57121': Application defined or object defined error - Run Time Error '57121': Application defined or object defined error Description You may see this error when trying to open the Early Power Estimator (EPE) in Excel 2007 or later. This error occurs if your ActiveX settings are disabled. No warning is issued that ActiveX is disabled. Resolution To avoid this error, perform the following steps: In Excel 2007 or later, click on the Office Button, (the top left round icon) Select Excel Options Select the Trust Center category and click Trust Center Settings Select the ActiveX Settings category Change the setting from Disable all controls without notification to one of the other options. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']