I developed a Solution based on OpenXML and SharePoint. It is developed as a Sandboxed Solution as I don't have access to the Server.
However, when deploying the Solution to Office 365, I get the following Error:
Error validating assembly 'DocumentFormat.OpenXml.dll'.This solution references prohibited type 'System.Runtime.Remoting.ObjectHandle' and cannot be used on this site collection.
To me, this looks like it is NOT POSSIBLE to create Sandboxed Solutions or Solutions for Office 365 with OpenXML. However, in the Article when OpenXML 2.0 was announced, there is a statement that Sandboxed Solutions are possible. (Link:: http://openxmldeveloper.org/blog/b/openxmldeveloper/archive/2010/03/08/8242.aspx)
My Question is:
a) what is this error about?
b) is it possible to have OpenXML in Office 365?