[Ipopt] Unknown File Exception

[Markus Sauermann]

Hello,

I am using Ipopt 3.9.3 from Psopt.

In a problem I try to solve, I get this error message:

"Exception of type: IpoptException in file "Unknown File" at line -1:
 Exception message: Unknown Exception caught in Ipopt"

Any ideas where I should look to resolve this issue?

Best wishes
Markus