H1B revoked

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I received an email from USCIS as below

There has been a recent processing action taken on your case. 

Receipt Number: XXXX

Application Type: I129, PETITION FOR A NONIMMIGRANT WORKER 

Your Case Status: Post Decision Activity 

On June XXXX, we revoked the approval of your case, Receipt Number XXXX, and mailed you a revocation notice. It explains the reasons for our action. Please follow the instructions in the notice and submit any requested materials. If you do not receive your revocation notice by XXXX, please go to www.uscis.gov/e-request to request a copy of the notice. If you move, go to www.uscis.gov/addresschange to give us your new mailing address. 

For approved applications/petitions, post-decision activity may include USCIS sending notification of the approved application/petition to the National Visa Center or the Department of State. For denied applications/petitions, post-decision activity may include the processing of an appeal and/or motions to reopen or reconsider and revocations. 

 

I am not sure y my H1 B was revoked? 

Is it possible to transfer my H1 B to another employer if so will it come under cap exempt since its been few months after approval?

please post your inputs, it will really help