Error: DT_FAC >= 1. Recovery not possible!

Here I use the 2D dimentional simulation for MFIX-TFM model, set the time step as shown in figure. the picture of model shown below, could anyone please figure out how to deal with this error?

You should use a time step factor of 0.9 so you have a chance to adjust the time step in case of non-convergence.

Thank you so much for the reply, i have just deleted the Dt_fac and this seemd to benefit~