User-reported unhelpful error message

[codeworld-feedback]

trafficstars

Program: https://code.world/#PRtjlQ0VZUlzcDY5iezE7bQ

Message:

program.hs:5:5-7: error: 
    • Couldn't match expected type Picture
                  with actual type Color -> Picture
    • Probable cause: rta is missing arguments
      In the argument(s) of (&), namely rta
      In the expression: rta & rtb & rtl
      In an equation for rts: rts = rta & rtb & rtl