"FOR without a matching NEXT" even though there is a next for it.

Dear readers,
I wrote the following

Code:

---

    for counter_outside = 1 to ((Y_top - Y_below)/steps)
        for counter = 1 to ((X_right - X_left))
            if right_left = 1 then
                GOSUB Turn_left
                right_left = 0
            else
                GOSUB Turn_right
                right_left = 1
            endIF
            Pause 20
        NEXT counter
       
        for counter = 1 to steps
            if top_below = 0 then
                GOSUB Turn_below
            else
                GOSUB Turn_top
            end
            Pause 20
        NEXT counter
       
    NEXT counter_outside

---

and microcode studio says "FOR without a matching NEXT." and marks counter_outside. What is wrong ?

I found it.

Code:

---

            else
                GOSUB Turn_top
            end

---

should be

Code:

---

            else
                GOSUB Turn_top
            endif

---

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