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HubSpot Sales for Outlook install error: 'Application cannot be started. Contact the application vendor.'

Last updated: January 21, 2026

Available with any of the following subscriptions, except where noted:

All products and plans

You may encounter the following error messages when attempting to install the HubSpot Sales Outlook desktop add-in:

Application cannot be started. Contact the application vendor.

To resolve this error:

Uninstall the HubSpot Sales Outlook desktop add-in.
Press CTRL + ALT + DEL and open Task Manager, then end the SidekickTrayWPF.exe process.
Navigate to Control Panel and select Uninstall a program or Add or remove programs.
Search for and uninstall HubSpot Sales for Windows.
Install the HubSpot Sales for Windows tray app.

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