I have a file already saved in my system and I know the GUID of that file. Due to some reasons I am bound to use this approach of first saving the file and then adding it to CuteWebUI.UploadAttachments manually via AddCustomAttachment.

 

The code i have written is:

 

Guid g = new Guid(ItemChar2C[0].ToString().Substring(18).ToString());
                Attachments1.AddCustomAttachment(g); 

 

But I am getting error of "Missing CustomProvider"

 

Please help.