Error de elemento web: No se pueden crear elementos XmlSerializers para este elemento web.

Detalles del error:
[WebPartPageUserException: No se pueden crear elementos XmlSerializers para este elemento web.]
  at Microsoft.SharePoint.WebPartPages.WebPartTagReader.ParseWebPartTag()
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CompressUsingXmlDeserializer(SourceContent sourceContent)
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CompressInOrder(Deserializer firstMethod, Deserializer secondMethod, SourceContent sourceContent, String allRegisterDirectives, Boolean isClosed)
Error de elemento web: No se pueden crear elementos XmlSerializers para este elemento web.

Detalles del error:
[WebPartPageUserException: No se pueden crear elementos XmlSerializers para este elemento web.]
  at Microsoft.SharePoint.WebPartPages.WebPartTagReader.ParseWebPartTag()
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CompressUsingXmlDeserializer(SourceContent sourceContent)
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CompressInOrder(Deserializer firstMethod, Deserializer secondMethod, SourceContent sourceContent, String allRegisterDirectives, Boolean isClosed)
Error de elemento web: No se pueden crear elementos XmlSerializers para este elemento web.

Detalles del error:
[WebPartPageUserException: No se pueden crear elementos XmlSerializers para este elemento web.]
  at Microsoft.SharePoint.WebPartPages.WebPartTagReader.ParseWebPartTag()
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CompressUsingXmlDeserializer(SourceContent sourceContent)
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CompressInOrder(Deserializer firstMethod, Deserializer secondMethod, SourceContent sourceContent, String allRegisterDirectives, Boolean isClosed)
Error de elemento web: No se pueden crear elementos XmlSerializers para este elemento web.

Detalles del error:
[WebPartPageUserException: No se pueden crear elementos XmlSerializers para este elemento web.]
  at Microsoft.SharePoint.WebPartPages.WebPartTagReader.ParseWebPartTag()
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CompressUsingXmlDeserializer(SourceContent sourceContent)
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CompressInOrder(Deserializer firstMethod, Deserializer secondMethod, SourceContent sourceContent, String allRegisterDirectives, Boolean isClosed)