It means there is a redundant equation and one missing one. This is due to Walras Law. Check your market clearing conditions, one of the equations could be redundant. Also see Colinearities
The trick is to start from a very small model by shutting down a number of equations and try if the code runs. If it does’t fix the error then run the code again and again until it runs. Once it runs, then add one equation at time.
The smaller the model, the easier it is to identify the problem then you build from there.
Best