Jetta not starting

hi . i seem to be having an issue with my jetta mk5. 1.9tdi. whilst driving the engine cut out and now wont start at all. checked all fuses and relays. all working. checked fuel line. all clear. checked diesel pump. 100%. now when i try to start i get a "oil presure low engine off" warning. what could be the problem? i topped up the pil to the correct level and still gives me the warning

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