What potential reasons could lead to the error message "Invalid ProgID, GUID string, or Moniker" when using COM in PHP?

The error message "Invalid ProgID, GUID string, or Moniker" typically occurs when the ProgID, GUID string, or Moniker used in the COM object instantiation is incorrect or not recognized by the system. To solve this issue, ensure that the ProgID, GUID string, or Moniker is correct and corresponds to a valid COM object on the system. Double-check the spelling and formatting of the ProgID, GUID string, or Moniker to ensure they are accurate.

$com = new COM('correct_progID_or_GUID_string_or_Moniker');