Ramsey Optimal Policy

I have a linear model and when I try to run ramsey with a linear planner objective function, it crashes.
This is while there is no problem when I use a quadratic function as the planner objective.
Would you mind advising me if there is any way to solve this problem.

The error I get is:

Some element of Newton direction isn’t finite. Jacobian maybe singular or there is a
problem with initial values

Thank you

Looks like your model does not have a unique steady state.

If you want more detailed advice, you have to post your MOD-file.