"Stop! Engine Oilpressure'' message

[RRD]

Guys,

I have a 2002 Range TD6 diesel. It has the same engine as an E53 X5 3.0d.
I'm having the following problem with my car and I'm wondering if any of you guys have had this problem too? And wether you guys have some ideas.

When I brake and the car is almost standing still the red oil can on the dash board lights up and on the info display it says ''Stop! Engine Oilpress''. It keeps saying this when I'm standing still in D, foot on the brake. The moment I even touch the gas it disappears.

I just changed my oil to make sure that isn't the problem. Oil level is perfect.

Any ideas? Thanks!