{"action":"opened","issue":{"url":"https://api.github.com/repos/Pyomo/pyomo/issues/144","repository_url":"https://api.github.com/repos/Pyomo/pyomo","labels_url":"https://api.github.com/repos/Pyomo/pyomo/issues/144/labels{/name}","comments_url":"https://api.github.com/repos/Pyomo/pyomo/issues/144/comments","events_url":"https://api.github.com/repos/Pyomo/pyomo/issues/144/events","html_url":"https://github.com/Pyomo/pyomo/issues/144","id":227896435,"number":144,"title":"Ipopt error: Unknown keyword \"hessian_constant\"","user":{"login":"sartorg","id":11919820,"avatar_url":"https://avatars2.githubusercontent.com/u/11919820?v=3","gravatar_id":"","url":"https://api.github.com/users/sartorg","html_url":"https://github.com/sartorg","followers_url":"https://api.github.com/users/sartorg/followers","following_url":"https://api.github.com/users/sartorg/following{/other_user}","gists_url":"https://api.github.com/users/sartorg/gists{/gist_id}","starred_url":"https://api.github.com/users/sartorg/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sartorg/subscriptions","organizations_url":"https://api.github.com/users/sartorg/orgs","repos_url":"https://api.github.com/users/sartorg/repos","events_url":"https://api.github.com/users/sartorg/events{/privacy}","received_events_url":"https://api.github.com/users/sartorg/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2017-05-11T07:04:06Z","updated_at":"2017-05-11T07:04:06Z","closed_at":null,"body":"Using Ipopt 13.2.6 with Pyomo 5.1.1. and Python 2.7.10 gives me the following error when trying to add the option `hessian_constant = yes` (see list of options [here](https://www.coin-or.org/Ipopt/documentation/node44.html)):\r\n\r\n```\r\nlinear_solver=ma27\r\nUnknown keyword \"hessian_constant\"\r\nmax_iter=1000\r\nmax_cpu_time=20\r\nhonor_original_bounds=no\r\nacceptable_tol=0.001\r\nlinear_solver=ma27\r\nUnknown keyword \"hessian_constant\"\r\nmax_iter=1000\r\nmax_cpu_time=20\r\nhonor_original_bounds=no\r\nacceptable_tol=0.001\r\nERROR: \"[base]/site-packages/pyomo/opt/base/solvers.py\", 599, solve\r\n\tSolver (asl) returned non-zero return code (1)\r\nERROR: \"[base]/site-packages/pyomo/opt/base/solvers.py\", 602, solve\r\n\tSee the solver log above for diagnostic information.\r\n```\r\n\r\nCouldn't find any reason why Pyomo should through this error."}}
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