I have previously successfully solved a mechanical system using the gekko package. However, without having changed anything in my code, I now get the following error message:

---------------------------------------------------------------------------
Exception                                 Traceback (most recent call last)
Cell In[3], line 15
     13 m.Equation (F_r ==  (((1-a)/3)**2 + (2*(1+a)/3)**2 * v)) 
     14 m.Equation (a == (1000 - F_l)/mass)
---> 15 m.solve(disp=False)
     16 plt.plot(x)
     17 print(x)

File ~/anaconda3/envs/conda_calculator/lib/python3.11/site-packages/gekko/gekko.py:2210, in GEKKO.solve(self, disp, debug, GUI, **kwargs)
   2208 #print APM error message and die
   2209 if (debug >= 1) and ('@error' in response):
-> 2210     raise Exception(response)
   2212 #load results
   2213 def byte2str(byte):

Exception:  @error: Model File Not Found
 Model file does not exist: 130.92.213.86_gk_model0.apm
 STOPPING...

To understand how gekko is working, I have run examples that are presented here. These were also working, and now show the same error message.

Any idea what is going on or what I missed? Thanks!