Error while using time-dependent study

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Hello, I get the error

" Complex value found in discontinuous Galerkin evaluation. -Expression:(comp1.cee.gamma_rho)*1-(0)" while using explicit Runga-Kutta method

and "BDF solver does not support discontinuous Galerkin." while using Implicit BDF solver

I am working on High Mach number flow, Laminar and Compressible Euler equations for supersonic expansion in different types of nozzles . I encounter these errors only in time dependent study. The stationary study works perfectly fine.

Is there anyway to solve these errors?

Thank you.



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