I Am Learning German

My partner and I once had people over for dinner who spoke German, and my partner thought it would be a good idea to have all of us speak in German together, to help me understand the language better. All was going well for a while. I was making mistakes but nothing too bad - that was until the end of the night. I accidentally said “Es ist kein Spass fuer mich, Ihnen Kaffee zu machen.” (It’s no fun making coffee for you) instead of “Es ist kein Problem, fuer Sie Kaffee zu machen.” (It’s no problem making coffee for you).