@User if you place a component that has 'template="name=x1 ..." in its symbol definition, it will be automatically renamed to x1, x2, x3, ... the first name that is not already used. If you place another compoent which has 'trmplate="name=X1 ..." it will be named X1, X2, X3, .... the first name that is not already used. so you will end up having some 'xn' and some 'Xn' instances, that is an error for spice simulators. Anyway you can manually correct this by renaming the duplicates. If you set template strings of all symbols (either with uppercase X or lowercase x) consistently this issue won't happen.