Error in importation of linopy : MOSEK license not found about linopy HOT 7 CLOSED

You're totally right! No MOSEK license should be required.

@FabianHofmann something maybe going wrong with the new context manager?

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mmh, it works for me for all combinations:

• package uninstalled, no license
• package installed, no license
• package installed, with license

are you on the latest master?

from linopy.

I installed with pip.

from linopy.

okay, could you then update the linopy package via pip? I just released version 0.3.2

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It works now, thanks a lot.

from linopy.

great!

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Hello @FabianHofmann

I am having a similar issue where I am not able to use the MOSEK solver although I do not get any error messages. I have installed the MOSEK package in the environment but it does not show up in the list of "available_solvers" in "linopy". I tried updating "linopy" as explained above but does not seem to change anything. Interestingly, I was able to use MOSEK a couple of days ago before the weekend but when I tried to use it again, it did not show up in the list of "available_solvers". I tried to work with gurobi to check if I was missing something but I was able to use gurobi.

Update:

with contextlib.suppress(ImportError):
    import mosek
    with contextlib.suppress(mosek.Error):
        with mosek.Env() as m:
            t = m.Task()
            t.optimize()
            m.checkinall()
        available_solvers.append("mosek")

When I was debugging, the code stopped at "t.optimize()" and did not reach checkinall and append.

And it seems like it is a licensing error:

raise Error(rescode(_res_optimizetrm),_msg_optimizetrm)
mosek.Error: rescode.err_license_cannot_connect(1021): MOSEK cannot connect to the license server.

But from what I understand, I should be able to use MOSEK without license. Am I right or am I missing something?

Update - Solution:

I was able to figure it out.

It seemed like the code was not able to access the license file.

I manually added this during debugging to point out the location:

os.environ["MOSEKLM_LICENSE_FILE"] = "pathtolicensefile"

and from next time on it was able to automatically locate the license file.

Please look into this issue if necessary.

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