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Error: A Runtime Error has occurred. Do you wish to Debug?

Error Message

When trying to open an ArcToolbox tool or open the Environments on the Tools > Options > Geoprocessing tab, the following or similar error message(s) is displayed:

"A Runtime Error has occurred.
Do you wish to Debug?

Line: 217
Error: Syntax error"

Cause

One possibility is that one or more MS XML .dll files are not properly registered.

Solution or Workaround

Manually re-register the msxml.dll, msxml2.dll and msxml3.dll.

  1. Navigate to Start > Run, type cmd and click OK.
  2. Type the following and press enter:

    Code:
    cd c:\windows\system32

  3. Type the following and press enter:

    Code:
    regsvr32 msxml.dll

  4. Type the following and press enter:

    Code:
    regsvr32 msxml2.dll

  5. Type the following and press enter:

    Code:
    regsvr32 msxml3.dll