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Error 'Class not registered - REGDB_E_CLASS..' when upgrading Controller 2.3 forms to Controller 8.x

Troubleshooting


Problem

Customer is migrating from Controller 2.x to Controller 8.x or 10.x. As part of this process, the consultant clicks 'Maintain' - 'Special Utilities' - 'Convert' - 'Forms to New Design...' Consultant receives error message. Consultant clicks OK, and receives further error messages.

Symptom

Error #1

    --System.Runtime.InteropServices.COMException (0x80040154): Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))
    at System.Windows.Forms.UnsafeNativeMethods.CoCreateInstance(Guid&clsid, Object punkOuter, Int32 context, Guid&iid)
    at System.Windows.Forms.AxHost.CreateWithoutLucense(Guid clsid)
    at System.Windows.Forms.AxHost.CreateWithLicense(String license, Guid clsid)
    at System.Windows.Forms.AxHost.CreateInstanceCore(Guid clsid)
    at System.Windows.Forms.AxHost.CreateInstance()
    at System.Windows.Forms.AxHost.GetOcxCreate()
    at System.Windows.Forms.AxHost.TransitionUpTo (Int32 state)
    ....
    -Host:
    -Application:
    -Assembly: frmConvertOldForms.dll
    -Class: frmConvertOldForms.dll

Error #2
    Failed to load Assembly. Object reference not set to an instance of an object.

Error #3
    -- System.NullReferenceException: Object reference not set to an instance of an object
    at Cognos.Controller.Forms.ControllerMDI.DoShowForm (ControllerMenuItem& ClickedItem, String sAlternatename.Space)
    AssemblyFile= frmConvertOldForms.dll
    FormName= Cognos.Controller.Forms.Form.frmConvertOldForms
    MenuID=60302

[{"Product":{"code":"SS9S6B","label":"IBM Cognos Controller"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Component":"Controller","Platform":[{"code":"PF033","label":"Windows"}],"Version":"8.5.1;8.5;8.4;8.3;10.1","Edition":"","Line of Business":{"code":"LOB76","label":"Data Platform"}},{"Product":{"code":"SSMRTZ","label":"IBM Cognos Controller on Cloud"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Component":" ","Platform":[{"code":"","label":""}],"Version":"","Edition":"","Line of Business":{"code":"LOB76","label":"Data Platform"}}]

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Historical Number

1033059

Document Information

Modified date:
08 May 2025

UID

swg21347126

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