I just had my 06 BMW tensioner spring and belt replaced on 11/17/10 and on 11/19/10, I got the following message:

"Fault in pass.- Restraint system affecting airbag, belt tensioner or belt- force limter.
Fasten and continue to wear belts".

What does this error means? Does this means the work I had done is causing this message. My wife and I stop by a bank I stayed in the car while it was running and she loosen her seltbelt and got out, not 10 seconds later that message came on. Does it have something to do with the sealtbelts? Is it something I can reset. Please help
ASAP. Thanking you in advance.