# Operation Failed: Result Invalid Body error when I use shell tool

**URL:** <https://discourse.shapr3d.com/t/operation-failed-result-invalid-body-error-when-i-use-shell-tool/5586>\
**Category:** Modeling Questions\
**Created:** [September 10, 2019, 11:39pm UTC](https://discourse.shapr3d.com/t/operation-failed-result-invalid-body-error-when-i-use-shell-tool/5586 "2019-09-10T23:39:07Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Shock9616](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/shock9616/32/2053_2.png) [@Shock9616](https://discourse.shapr3d.com/u/Shock9616)\
**Post date:** [September 10, 2019, 11:39pm UTC](https://discourse.shapr3d.com/t/operation-failed-result-invalid-body-error-when-i-use-shell-tool/5586/1 "2019-09-10T23:39:07Z")

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Hello all,

I am attempting to make a shell form of one of my projects that could be used as a handheld gaming console enclosure. I am having trouble with the shell tool: when I use it to shell out the two halves that I have created, I am getting an error saying that the operation failed and gave me an invalid body. This worked the first time I did it but I noticed an error and had to restart and now I can’t get back to where I was before. I have provided the .shapr file so can someone else please try and reproduce it? Thanks!

> **[GamePi Advanced Shell.shapr](https://drive.google.com/file/d/1lwFmC_H-msmbWyUylXdNn7jSGKmHyxpH/view?usp=drivesdk)**
>
> Google Drive file.

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**Author:** ![Robert](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/robert/32/1329_2.png) [@Robert](https://discourse.shapr3d.com/u/Robert)\
**Post date:** [September 11, 2019, 5:52am UTC](https://discourse.shapr3d.com/t/operation-failed-result-invalid-body-error-when-i-use-shell-tool/5586/2 "2019-09-11T05:52:52Z")

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![bild](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/9/983e02704f13399ec2b700fdfe4fd39ab4d26389.jpeg) ![bild](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/2/2bf2171ad94ca14fec76ce51e30b0280c61cdcf9.jpeg) I noticed that the units were set to cm, I use to work with mm so I did the shell tool with thickness 1 that i thought was in mm (but so wasn’t the case) with the same error as you, then tried with 0.1 and it was a success 👍🏻

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**Author:** ![Shock9616](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/shock9616/32/2053_2.png) [@Shock9616](https://discourse.shapr3d.com/u/Shock9616)\
**Post date:** [September 11, 2019, 4:45pm UTC](https://discourse.shapr3d.com/t/operation-failed-result-invalid-body-error-when-i-use-shell-tool/5586/3 "2019-09-11T16:45:18Z")

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Oh yeah! I completely forgot about that! Thank you so much!