[Coin-ipopt] ASL error message: "solver cannot handle CLP extensions" ?

[David Elixmann]

Hello,

I'm trying to solve an AMPL model, and IPOPT gives me the error message:

   ASL error message: "solver cannot handle CLP extensions" 

What does that error message mean? What is a CLP extension, and how can I avoid it? 

The model solved just fine with IPOPT, until I commented out some equations. Then this error message appeared. I am using Ipopt version 3.2.4. 

Best regards,

David Elixmann
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