# Voxl-mapper able to build but missing symbol on the board

Source: https://forum.modalai.com/topic/1196/voxl-mapper-able-to-build-but-missing-symbol-on-the-board
Category: Autonomy: VIO, Mapping and Navigation (https://forum.modalai.com/category/19/autonomy-vio-mapping-and-navigation)
Tags: mapping
Posted: 2022-08-12 07:23:16 UTC by Nishkala
Replies: 1 · Views: 2260

## Nishkala · 2022-08-12 07:23:16 UTC

![b8d2ac92-9e85-41c2-affb-4673e91766f2-image.png](https://forum.modalai.com/assets/uploads/files/1660288814076-b8d2ac92-9e85-41c2-affb-4673e91766f2-image.png) 

We were able to compile voxl-mapper on voxl-cross and deploy it on the voxl.

When we try running voxl-mapper, on the voxl2, we get the error 'voxl-mapper: symbol lookup error: voxl-mapper: undefined symbol: _ZNK7voxblox5LayerINS_9EsdfVoxelEE10saveToFileENSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEb
' as seen in the image.

How can this error be fixed?

## Reply by Guest · 2022-08-12 17:19:13 UTC

@Nishkala,

This looks like a version mismatch between the voxl-voxblox you built against and the version you have on your VOXL. 

To ensure the versions match, you need to install the build dependencies from the last release in voxl-cross before deploying to voxl. This can be done by running:
```
 ./install_build_deps.sh apq8096 sdk-0.8
```
instead of 
```
 ./install_build_deps.sh apq8096 stable
```