Problem with Avalon Slave Template

Quartus shouldn't care since it has nothing to do with these .tcl files. Do you mean that Qsys detects an error? If Qsys is emitting errors with an exact package being used that means there is a command in the .tcl file that is not supported by that particular package version. So you would have to clean up those commands to make sure you are using what is defined in the package. That's the whole point of the exact package, you ensure that you are using a specific version of the API and by declaring this at the top of your file you don't have to worry about the .tcl file breaking in future versions.