To understand the error, you must first understand the file itself. ubiorbitapi-r2-loader.dll is a component associated with the (often referred to as Uplay, and now Ubisoft Connect).
On : Right-click the game > Properties > Local Files > Verify integrity of game files. ubiorbitapi-r2-loader.dll assassin 39-s creed 2
Here are the proven methods to fix the ubiorbitapi-r2-loader.dll error. Start with Method 1 and work your way down. To understand the error, you must first understand