while simulating SR transistor based circuit (simulink file attached) the MATLAB stop with error code

['SR/Solver Configuration']: Steady state solve failed to converge.

Nonlinear solver: failed to converge, residual norm too large.

Equations (including nonlinear equations) of one or more components may be dependent or inconsistent. This can cause problems in transient initialization. Here is the set of components involved:

Answer 1

[Sabin]

This model is structurally singular because some variables are missing from the final set of equations. There is no Electrical Reference, add one and the model should simulate without errors.