Troubleshooting code

[mahmudengbd]

After overhauling the engine:
MERCURY, VERADO, 250 HP
Model: 1250V34ED
Serial No. 1B781600

The Engine is cranking (at 170 RPM) but not starting at all.
An alarm is raising and display Monitor on panel board:

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ALARM DETAILS
-1
NullReferenceException
Class = MT ControlCoreInterface

Method = ResetDevices
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How do I solve this problem.