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Error in the sage online cell related to GAP

Typing this into the online sage cell (https://sagecell.sagemath.org/) gives an error (using the GAP language):

LoadPackage("qpa");
Q:=Quiver(3,[[1,2,"a"],[2,3,"b"]]);KQ:=PathAlgebra(GF(3),Q);AssignGeneratorVariables(KQ);rel:=[a*b];A:=KQ/rel;

But this error doesnt occur when opening GAP in a terminal and entering the code. So my question is whether there is a problem in the sage online cell related to GAP or how I can fix this. Is there by the way another site offering to use GAP online?

Error in the sage online cell related to GAP

Typing this into the online sage cell (https://sagecell.sagemath.org/) gives an error (using the GAP language):

LoadPackage("qpa");
Q:=Quiver(3,[[1,2,"a"],[2,3,"b"]]);KQ:=PathAlgebra(GF(3),Q);AssignGeneratorVariables(KQ);rel:=[a*b];A:=KQ/rel;

But this error doesnt occur when opening GAP in a terminal and entering the code. So my question is whether there is a problem in the sage online cell related to GAP or how I can fix this. Is

(Is there by the way another site offering to use GAP online?online?)