If an error of this type occurs:
"Retrieving the COM class factory for component with CLSID{000000E4-0000-000F-1000-000AC0BA1001} failed due to the following error: 80040154 Class not saved (Exception from HRESULT: 0x80040154(REGDB_E_CLASSNOTREG)).".
This is because the SDK DLLs are not properly saved on the server on which AcombaWebService is installed.
Follow these steps to re-save the DLLs:
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Openthe Acomba software
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Goto the Info menu> About
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Press the "Info" button on the bottom left-hand side of the window
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Go to the SDK tab, make sure that the directory is properly configured and then press "Save Configuration"