<p>Apparently, all that I was missing was a <code>STOP</code> block at the end of the thread. Hopefully my oversight helps future users.</p>

<p>The <code>STOP</code> block looks like so:</p>

<p><a href="https://i.sstatic.net/XayUL.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/XayUL.png" alt="enter image description here"></a></p>

CC BY-SA 4.0
2020-05-10T16:42:59.260Z
Do you happen to have a picture of correct program with a "STOP" block to include in your answer?
Alex
CC BY-SA 4.0
2020-05-10T16:45:06.480Z
@Alex do you think a picture of just the STOP block would work?
Brandon_J
CC BY-SA 4.0
2020-05-10T16:23:24.747Z
2020-05-10T16:47:08.567Z
2020-05-10T16:47:08.567Z
Brandon_J
<p>I pulled out my NXT recently to tinker around with it. After reconstructing one of the suggested builds, I was writing a small program for it. About halfway through, I needed to leave my work, so I tried to save the file, but I was unable to. I received the following completely straightforward and not confusing error message:</p>

<p><a href="https://i.sstatic.net/Sj0n0.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/Sj0n0.png" alt="error message"></a></p>

<p>The text of the error message reads</p>

<p><code>Insane object at BHDP+3C18 in "Arm4Caleb.rbt": {graphics } (0x80): Loop Tunnel DCO )</code></p>

<p>with Arm4Caleb.rbt being the name of the file. I have failed to find what this error message may be referring to.</p>

<p>I also attempted to save a blank NXT program file; this was successful, leading me to believe that there was something wrong with my particular program. Consequently, I attach an image of the NXT program (I can't post the file because I can't save it):</p>

<p><a href="https://i.sstatic.net/KsINI.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/KsINI.png" alt="program"></a></p>

<p>The program is in collapsed mode so that I can screenshot it; the alternate decision for the largest switch "box" is a use of the C motor; the alternate decision for the medium box is a use of the C motor in the opposite direction; the alternate decision for the smallest box is doing nothing.</p>

<p>It's been a while since I've tried this visual coding stuff; I suppose I have an error somewhere in here? I'm not sure why it would prevent me from at least saving the file, though.</p>

<nxt><nxt-g>
Unable to save NXT program
Brandon_J
# Unable to save NXT program

(Asked by: username_0 on 2020-04-27)

I pulled out my NXT recently to tinker around with it. After reconstructing one of the suggested builds, I was writing a small program for it. About halfway through, I needed to leave my work, so I tried to save the file, but I was unable to. I received the following completely straightforward and not confusing error message:

[![error message](https://i.sstatic.net/Sj0n0.png)](https://i.sstatic.net/Sj0n0.png)

The text of the error message reads

`Insane object at BHDP+3C18 in "Arm4Caleb.rbt": {graphics } (0x80): Loop Tunnel DCO )`

with Arm4Caleb.rbt being the name of the file. I have failed to find what this error message may be referring to.

I also attempted to save a blank NXT program file; this was successful, leading me to believe that there was something wrong with my particular program. Consequently, I attach an image of the NXT program (I can't post the file because I can't save it):

[![program](https://i.sstatic.net/KsINI.png)](https://i.sstatic.net/KsINI.png)

The program is in collapsed mode so that I can screenshot it; the alternate decision for the largest switch "box" is a use of the C motor; the alternate decision for the medium box is a use of the C motor in the opposite direction; the alternate decision for the smallest box is doing nothing.

It's been a while since I've tried this visual coding stuff; I suppose I have an error somewhere in here? I'm not sure why it would prevent me from at least saving the file, though.

**Tags:** nxt, nxt-g


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## 1 answers

### Answer by username_0 on 2020-05-10. Score: 3 | Accepted answer

Apparently, all that I was missing was a `STOP` block at the end of the thread. Hopefully my oversight helps future users.

The `STOP` block looks like so:

[![enter image description here](https://i.sstatic.net/XayUL.png)](https://i.sstatic.net/XayUL.png)

> **Comments:**
> **username_1**: Do you happen to have a picture of correct program with a "STOP" block to include in your answer?  
> **username_0**: @username_1 do you think a picture of just the STOP block would work?  

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