Custom UI Runtime Error

[annavanharten-png]

Describe the bug
When adding the add-in to powerpoint I am receiving the following error:

Custom UI Runtime Error in InstrumentaPowerpointToolbar (6)

Error found in Custom UI XML of
C:\Add-in\InstrumentaPowerpointToolbar (6).ppam:

Line: 104
Column: 121
Error Code: 0x80004005
Message: Unknown Office control ID: StyleInspector

Desktop (please complete the following information):

• Microsoft Edge Version 146.0.3856.62 (Official build) (64-bit)