service failed to start - ClassFactory cannot supply requested class

[ShaningYu]

I created a REST SOE on a service by following ESRI V10.1 Help's procedure.  On publishing the service (see the procedure:
http://resources.arcgis.com/en/help/arcobjects-net/conceptualhelp/#/How_to_enable_and_test_the_REST_...), after I clicked the Publish button, I got the error message:
service failed to start ... ClassFactory cannot supply requested class
I repeated and the error is still there.  How to fix it?  Thanks.

[ShaningYu · Accepted solution]

Fixed by referring http://forums.arcgis.com/threads/79744-ClassFactory-cannot-supply-requested-class, and re-compiling the soe project in 'ANY CPU' rather than in 'x86'.