Help with the cause of a calculation error?

Hello guys! Can someone take a look this error and give some advise?
When I calculated the particle buildup in an elbow with the TFM (without solving for the gas phase), the inlet boundary conditions was set mass flow inlet(volume fraction 0.2 and velocity 0.2 m/s) for the first 1.5 seconds, after which the inlet values were both changed to 0, led to the following error at t=1.52s.


test_2022-10-31T215903.595608.zip (20.1 MB)