Hi diserable,
what exactly is it that you are trying to do. It is difficult to see that from the error message alone. The thing is that (advanced) plotting is not done in Dynare but after running your mod-file in Matlab. For this you save your results and then call them again to plot.
Here is a sample code, which is for comparing to models but it should give you an idea about how it is done.
If you have a specific question, feel free to come back.