Model sim error: Trouble solving algebraic equations in differential-algebraic system.

Hi there,

I am having trouble running my model. It says the source of the error is unknown and I need help.

This is error I get when I run the model. I have attached the file.

Trouble solving algebraic equations in differential-algebraic system. Singular iteration matrix encountered with step size 0.0001 at time 0.0. Consider reducing the step size and/or providing more accurate initial conditions. If the problem persists, check the model structure and values of parameters.