Dear Thierno Ly

Please send a photo of the exact error text to see what factor have caused this warning ?

Do you assign plastic hinges ?

What are your load cases ?

Are you sure about structure stability during analysis ?

Yes i assigned fiber hinges to the colums, beams and bracings.

Thanks

Try to minimize time step value, . if Dt=0.1 sec you may applied for it i.e. dt =0.05 or dt=0.005 sec I hope it works for you.