ApplicationError: No executable found for solver 'ipopt' in Pyomo

I am learning Pyomo and trying to use ipopt to solve an example question. but initially, I have installed package, then it always shows that there is not a ipopt found. After that, I reinstalled many time, now it shows that

'''WARNING: Could not locate the 'ipopt' executable, which is required for solver ipopt --------------------------------------------------------------------------- ApplicationError Traceback (most recent call last) <ipython-input-2-2e55f87657f9> in <module> 1 model.N=50 2 instance = model.create_instance() ----> 3 results = opt.solve(instance) # solves and updates instance D:\Anacondo\lib\site-packages\pyomo\opt\base\solvers.py in solve(self, *args, **kwds) 514 """ Solve the problem """ 515 --> 516 self.available(exception_flag=True) 517 # 518 # If the inputs are models, then validate that they have been D:\Anacondo\lib\site-packages\pyomo\opt\solver\shellcmd.py in available(self, exception_flag) 116 if exception_flag: 117 msg = "No executable found for solver '%s'" --> 118 raise ApplicationError(msg % self.name) 119 return False 120 return True ApplicationError: No executable found for solver 'ipopt' '''**bold** 

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I have no idea how to fix it and I installed anaconda in desk D instead of C. Could anyone please help me, I need it for an assignment and exam in a month. Thanks.

5 Answers

I got the same problem after installing 3.13.1. What I did is just to download 3.11.1, then save ipopt.exe in C:\ProgramData\Anaconda3\Library\bin

Then it works.

For mac users:

1. Install homebrew in the terminal by:
   rm -fr $(brew --repo homebrew/core)
brew tap homebrew/core

2. Install ipopt by:
   brew install ipopt

3. Restart your IDE.

Please, check this discussion . I reported the same issue. Perhaps, you should downgrade IPOPT version to the supported one (v3.11.1).

The issue has been solved by installing the latest version of anacondo and the 3.11 version of ipopt

install this version: conda install -c conda-forge/label/cf202003 ipopt

from this link: