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Thanks for your request. Aspsoe.Words reads registry to find an appropriate font. Registry key is font name and registry value is font file name. If font does not exist in the defined location, Aspose.Words cannot find the appropriate font and most likely this is the reason of the problem.
Please make sure that the font was deleted properly and there is not registry key associated with this font. If the registry key still exists, you can just delete corresponding key from registry manually. You can find this key here:
Also, please attach your document here for testing.