# "tuple index out of range" and "could not convert string to float" - Musculoskeletal Analysis

**URL:** <https://discourse.slicer.org/t/tuple-index-out-of-range-and-could-not-convert-string-to-float-musculoskeletal-analysis/39728>\
**Category:** Support\
**Tags:** extensions\
**Created:** [October 16, 2024, 6:20pm UTC](https://discourse.slicer.org/t/tuple-index-out-of-range-and-could-not-convert-string-to-float-musculoskeletal-analysis/39728 "2024-10-16T18:20:08Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sp01](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sp01/32/78242_2.png) [@sp01](https://discourse.slicer.org/u/sp01)\
**Post date:** [October 16, 2024, 6:20pm UTC](https://discourse.slicer.org/t/tuple-index-out-of-range-and-could-not-convert-string-to-float-musculoskeletal-analysis/39728/1 "2024-10-16T18:20:08Z")

</div>

I was hoping to use the Musculoskeletal Analysis Extension, specifically the Density Analysis function, for a project, but I’m having trouble getting it to run in practice tests.  
When I run the Density Analysis on the extension’s sample dataset following the instructions, I get a “could not convert string to float” error. When I try to run the module using the dataset provided by 3D Slicer, I get a “tuple index out of range” error.  
Has anyone encountered these issues before, and are there any solutions available?  
Thank you all for your time!  
Slicer version: 5.6.2  
Operating system: macOS Monterey