Problem diverges: Scalar transport equation, variable: Species transport, material
 

Hi dears
I used ECFM model for modelling DISI Hydrogen engine. I faced this error:
Problem diverges: Scalar transport equation, variable: Species transport, material
and my temperature becomes NAN.
I reduced Energy under relaxation factor to 0.02. but still I have this error.
I think it's sth about species.
would u please help me??