Unable to cast COM object of type 'Microsoft.Office.Interop.Outlook.ApplicationClass'


Would like to ask help on the below error:

Unable to cast COM object of type ‘Microsoft.Office.Interop.Outlook.ApplicationClass’ to interface type ‘Microsoft.Office.Interop.Outlook._Application’. This operation failed because the QueryInterface call on the COM component for the interface with IID ‘{00063001-0000-0000-C000-000000000046}’ failed due to the following error: Interface not registered (Exception from HRESULT: 0x80040155).",“level”:“Error”,“logType”:“Default”,“timeStamp”:“2018-05-20T17:28:51.2730224+02:00”,“fingerprint”:“b0e2e24e-7d88-452d-b75e-516479baac7f”,“windowsIdentity”:

Thanks a lot,
Kind regards,

Hi @dana_vm,

Take a look


This may be the cause of office itself.

Please try following solution, it worked for me! May be you have 2 or more versions of office installed in your computer, in registry. you have to choose one and delete one.


The registry on this machine contains a key for an older version of the Outlook View Control.  
It was leftover from a previous Microsoft Office  installation.


Close Outlook.
Open the registry editor by running REGEDIT.
From the highest level, do an export to make a backup of the registry, just in case.
Locate the key: HKEY_CLASSES_ROOT\Typelib\0006F062-0000-0000-C00-000000000046
Within that folder, there will be two keys: 1.0 and 1.1 (1.0 is from an older version of Office,  1.1 is from Office 2010)
Delete the 1.0 key: HKEY_CLASSES_ROOT\Typelib\{0006F062-0000-0000-C00-000000000046}\1.0
Close the registry.
Reopen Outlook 

This is from linke https://answers.microsoft.com/en-us/office/forum/office_2013_release-outlook/outlook-today-script-error/075b0644-36c2-4771-860f-bfdcebc5545c

And I found in my computer there 1.1 and 1.2 key, but 1.2 was blank. So I delete 1.2 and reopen outlook, it worked. And Uipath could send out outlook email normally.

i just repaired my office and it worked…