You're calling configure on $ent but $ent is not an object
$ent is assigned the return value from g_pack
g_pack doesn't return an object
the return value of the g_pack method is not an object
g_pack returned something which is not an object
g_pack returned the empty string ""
"" the empty string does not have a configure method
"" the empty string is not an object
you can't call methods on the empty string ""
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