I am trying to stimulate 3d cardiac tissue with appropriate stimulus settings. However, the whole model cannot be activated, that is, the membrane potential of each cell is always around -86mV. I tried to use larger strength of the stimulus, or encase more points as the initial stimulus, but then met an error "L5 error: parabolic PDE solver diverged. Reason: iterations exceeded.".
Could you help me with this issue? If there is any related information I need to provide please let me know. Thank you so much!