Gwyneth Butera
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Gurobi Staff
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Articles
Recent activity by Gwyneth Butera-
Gurobi AI Modeling Tools
Modeler on Intelligence HubThe Gurobi Intelligence Hub is a web application that provides AI-powered agents to help you work more effectively with Gurobi products. One of these specialized agents i...
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How do I force Gurobi to stop using an old or incorrect license file?
If you have recently installed a new license but Gurobi still shows that it is using an old license, then Gurobi is not able to find the path to the new license file. To resolve this, please follow...
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How do I retrieve an Academic Named-User license?
To obtain a Named-User Gurobi license key file for your computer, you'll need to run the grbgetkey command on your machine to retrieve your Gurobi license key file from the Gurobi User Portal.The e...
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How do I resolve the error "No key code entered"?
The interactive shell was removed entirely in version 13, which was released in November 2025.When launching the Gurobi Interactive shell via gurobi.sh or a shortcut to gurobi.bat, you will be prom...
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How do I resolve an "ERROR 405" when running grbgetkey?
If grbgetkey produces a message that looks like this:info : grbgetkey version 13.0.3, build v13.0.3rc0 info : Contacting Gurobi license server... error : ERROR 405: Cannot reinstall license 99999...
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How do I set up a Named-User or Single-Machine or Single-Use or Unlimited Use-Unlimited User license?
To obtain a Gurobi license key for your computer, you'll need to run the grbgetkey command on your machine to retrieve your Gurobi license key from the Gurobi User Portal. Note that the machine mus...
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How do I resolve an "Error 10009: Unable to open Gurobi license file"?
The errorsUnable to open Gurobi license file 'C:\gurobi\gurobi.lic' Unable to open Gurobi license file '/Library/gurobi1303/gurobi.licare most likely caused by Gurobi environment variables that are...
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How do I set up and use a floating token server license?
When using a floating token server license, a program that calls Gurobi Optimizer must obtain a token from a Gurobi token server before it can solve an optimization model.Note: If you are setting u...
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How do I generate a license file for a computer without internet access?
Note: This process is not available for "self-service" Individual Named-User Academic licenses, which are listed as "Free Academic Trial" in the Gurobi User Portal.For situations in which the compu...
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How do I start a token server?
Important note: Most Gurobi licenses do not use the token server. You should only follow these instructions if you are setting up a floating license. If you are not sure whether you need to start a...