eraser paints instead erasing

Hi everyone, I am a complete beginner. I ran into a problem. On the canvas the eraser tool paints green instead of erasing. It erases fine on other layers. Can anyone suggest what might be done to fix it? thank you 

  • Hello, Sorry to hear that! Try these steps
    Close the application. 
    Holding SHIFT down, relaunch the application. Keep holding SHIFT down till you see a Dialog Box. 
    Click Restore all setting to factory defaults. Reset all workspaces. 

    Since you are resetting, recommend you save and export and customizations or workspaces. Please let us know if this resolves the issue.