Error HRESULT E_FAIL has been returned from a call to a COM component

Question

In Silverlight 4 app; what does this error mean?:

\"Error HRESULT E_FAIL has been returned from a call to a COM component.\"

It

Answer 1

I had this problem while I was encoding Live video and audio (using Microsoft Expression) and the next piece of code throws the exception randomly:

// Set bitrate
liveJob.OutputFormat.VideoProfile.Bitrate = new ConstantBitrate(2500);

// Set Video size
liveJob.OutputFormat.VideoProfile.Size = new Size(320,240); 

until i've figured out that the second line throws the exception while the first one is still running in another thread !

and of course, it was my fault - i've called the method in code, and it was also been called by Click event...