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ERROR -No Default Instance defined for PluginFamily Groupdocs


why do i get this error

Exception Details:
StructureMap.StructureMapException: StructureMap Exception Code: 202
No Default Instance defined for PluginFamily Groupdocs.Signature.Documents.ISignatureDocumentService, Groupdocs.Web.UI.Signature, Version=1.9.5535.32974, Culture=neutral, PublicKeyToken=null



We are sorry to hear that you have such issue. First of all please update the Signature library to the latest version.

Also please note that we will release a next generation Signature library soon and you will need to (if possible) to migrate on it. We will provide more info about it when it will be available.

Best regards.