Update DFGVariable.jl

Author: dehann

src/services/DFGVariable.jl

@@ -417,7 +417,7 @@ Retrieve solver data structure stored in a variable.
 """
 function getSolverData(v::DFGVariable, key::Symbol=:default)
     #TODO this does not fit in with some of the other error behaviour. but its used so added @error
-    vnd =  haskey(v.solverDataDict, key) ? v.solverDataDict[key] : (@error "Variable does not have solver data $(key)"; nothing)
+    vnd =  haskey(v.solverDataDict, key) ? v.solverDataDict[key] : (@error "Variable $(getLabel(v)) does not have solver data $(key)"; nothing)
     return vnd
 end