CASS LAKE — Erin Reyes had a problem — a good and a bad one, depending on how one looks at it. After founding Northern Dreams Gymnastics eight years ago, she’s grown the program so much that it outgrew its facilities. The building it called home on 2nd Street in Cass Lake was too small for the classes and teams it hosted, and the ceilings were too low for the older gymnasts. There’d be times when Northern Dreams would have to host practices at g…