<class ‘int’>
<class ‘list’>
[2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2]
Traceback (most recent call last):
File “maddpg_trainer.py”, line 151, in 
main()
File “maddpg_trainer.py”, line 143, in main
agent = MADDPGAgentTrainer(state_shape, action_size, num_agents, writer=writer, random_seed=48, dirname=dirname, print_every=100, model_path=args.model)
File “C:\ML-Agents\Katorina\maddpg.py”, line 331, in init
for i in range(self.num_agents)]
File “C:\ML-Agents\Katorina\maddpg.py”, line 331, in 
for i in range(self.num_agents)]
File “C:\ML-Agents\Katorina\maddpg.py”, line 86, in init
random_seed, fc1_units=self.config[‘FC1’], fc2_units=self.config[‘FC2’]
File “C:\ML-Agents\Katorina\models.py”, line 88, in init
self.fc2 = nn.Linear(fc1_units + action_size, fc2_units)
TypeError: unsupported operand type(s) for +: ‘int’ and ‘list’

This is the result of print(action_size)
I installed torch with this command without gpu.

conda install pytorch torchvision cpuonly -c pytorch

I had also tried to install a previous version of pytorch because I believed that this was the reason of the errors.
Installing without CUDA
conda install pytorch=0.4.1 -c pytorch