┌ Warning: The model has been modified since the last call to optimize! (or optimize! has not been called yet). If you are iteratively querying solution information and modifying a model, query all the results first, then modify the model.
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Hi @Jimery, welcome to the forum 
I hope this warning is somewhat self explanatory. See this part of the documentation for a deeper explanation: Solutions · JuMP
Let me know if you have follow-up questions.