| Code | OS API Source | Meaning |
|---|
| 1 | Sys.wait | Duration must be positive |
| 2 | Array.new | Array size must be positive |
| 3 | Math.divide | Division by zero |
| 4 | Math.sqrt | Cannot compute square root of a negative number |
| 5 | Memory.alloc | Allocated memory size must be positive |
| 6 | Memory.alloc | Heap overflow |
| 7 | Screen.drawPixel | Illegal pixel coordinates |
| 8 | Screen.drawLine | Illegal line coordinates |
| 9 | Screen.drawRectangle | Illegal rectangle coordinates |
| 12 | Screen.drawCircle | Illegal center coordinates |
| 13 | Screen.drawCircle | Illegal radius |
| 14 | String.new | Maximum length must be non-negative |
| 15 | String.charAt | String index out of bounds |
| 16 | String.setCharAt | String index out of bounds |
| 17 | String.appendChar | String is full |
| 18 | String.eraseLastChar | String is empty |
| 19 | String.setInt | Insufficient string capacity |
| 20 | Output.moveCursor | Illegal cursor location |