Problem with "solve()" class for MESSAGEix

[Sajid Abrar]

Dear All,

I was working on the Tutorials for developing the understanding of the working of MESSAGE Model.

I have to extend this to the calculation of long term energy supply for the country.

I am working with GAMS Version 30.3.0

In both cases "Westeros" and "Austian_energy_system", on running "solve()" command;

GAMS core program runs successfully and creates both Input and Output GDX files 

But the Jupyternote book show the following error and doesn't proceed further.

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-33-6454e8d7b2fb> in <module>
----> 1 scenario.solve()

~\anaconda3\lib\site-packages\message_ix\core.py in solve(self, model, solve_options, **kwargs)
    420             code; see :class:`.GAMSModel`.
    421         """
--> 422         super().solve(model=model, solve_options=solve_options, **kwargs)
    423 
    424     def rename(self, name, mapping, keep=False):

~\anaconda3\lib\site-packages\ixmp\core.py in solve(self, model, callback, cb_kwargs, **model_options)
   1298         # Iterate until convergence
   1299         while True:
-> 1300             model.run(self)
   1301 
   1302             # Store an iteration number to help the callback

~\anaconda3\lib\site-packages\message_ix\models.py in run(self, scenario)
     86 
     87         try:
---> 88             result = super().run(scenario)
     89         finally:
     90             # Remove the optfile regardless of whether the run completed

~\anaconda3\lib\site-packages\ixmp\model\gams.py in run(self, scenario)
    138                           self.comment or '',
    139                           as_str_list(self.equ_list) or [],
--> 140                           as_str_list(self.var_list) or [],
    141                           )

~\anaconda3\lib\site-packages\ixmp\core.py in _backend(self, method, *args, **kwargs)
    325     def _backend(self, method, *args, **kwargs):
    326         """Convenience for calling *method* on the backend."""
--> 327         return self.platform._backend(self, method, *args, **kwargs)
    328 
    329     # functions for platform management

~\anaconda3\lib\site-packages\ixmp\backend\base.py in __call__(self, obj, method, *args, **kwargs)
     23         for the method name, e.g. 'ts_{method}'.
     24         """
---> 25         return getattr(self, method)(obj, *args, **kwargs)
     26 
     27     def close_db(self):  # pragma: no cover

~\anaconda3\lib\site-packages\ixmp\backend\jdbc.py in read_gdx(self, s, path, check_solution, comment, equ_list, var_list)
    725         self.jindex[s].readSolutionFromGDX(
    726             str(path.parent), path.name, comment, to_jlist2(var_list),
--> 727             to_jlist2(equ_list), check_solution)
    728 
    729         self.cache_invalidate(s)

TypeError: Ambiguous overloads found for at.ac.iiasa.ixmp.objects.MsgScenario.readSolutionFromGDX(str,str,str,java.util.LinkedList,java.util.LinkedList,bool) between:
	public void at.ac.iiasa.ixmp.objects.MsgScenario.readSolutionFromGDX(java.lang.String,java.lang.String,java.lang.String,java.util.List,java.util.List,boolean) throws at.ac.iiasa.ixmp.exceptions.IxException
	public void at.ac.iiasa.ixmp.objects.Scenario.readSolutionFromGDX(java.lang.String,java.lang.String,java.lang.String,java.util.LinkedList,java.util.LinkedList,boolean) throws at.ac.iiasa.ixmp.exceptions.IxException

Thanks in advance for help.

Best Regards,

Abrar Sajid