Question: output=listprocedure

when solving using output=listprocedure i face this message :

Sys:= {seq}(eq[k], k= 1..18):

fsolve(Sys, {seq}(a[k], k= 1..18),output=listprocedure):

Error, (in fsolve) output = listprocedure is an invalid option

what should i do? how can i list my output to use in latter commands? for example i want to use the output of the problem to plot an expression that the outputs are the coefficients of that expression?

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