# Mender-binary-delta-generator - ERROR: No help topic for 'dump'

**URL:** <https://hub.mender.io/t/mender-binary-delta-generator-error-no-help-topic-for-dump/2965>\
**Category:** General Discussions\
**Tags:** thud\
**Created:** [December 9, 2020, 4:04pm UTC](https://hub.mender.io/t/mender-binary-delta-generator-error-no-help-topic-for-dump/2965 "2020-12-09T16:04:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![FloRiAn](https://avatars.discourse-cdn.com/v4/letter/f/898d66/32.png) [@FloRiAn](https://hub.mender.io/u/FloRiAn)\
**Post date:** [December 9, 2020, 4:04pm UTC](https://hub.mender.io/t/mender-binary-delta-generator-error-no-help-topic-for-dump/2965/1 "2020-12-09T16:04:15Z")

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Hello,  
I’m trying to create a delta update file using the mender-binary-delta-generator without success.  
The error shown is:  
No help topic for ‘dump’

This is what I did:  
I used this repo repo init -u [https://github.com/mendersoftware/meta-mender-community](https://github.com/mendersoftware/meta-mender-community)   
-m meta-mender-raspberrypi/scripts/manifest-raspberrypi.xml   
-b thud  
After preparing several things, I’m trying to get the mender delta upgrade up and running atm.  
So there’s are the versions 1.0.0 and mender-binary-delta\_1.0.1.bb included in the thud repo.  
I downloaded the generator for 1.0.1 and 1.1.0 and created two artefacts with individual artefact names.  
Now I want to run the generator to get the delta.mender file.  
First error was that the command mender-artifact cannot be found. I located the x86 version in the sysroot folder of the yocto env and copied this file to /usr/local/bin of my build host.  
So the command is found.  
When I run the generator now using this command:  
./mender-binary-delta-generator -n v1.2-deltaform-v1.1.mender release-v.1.1.mender release-v.1.2.mender  
I get an error:  
No help topic for ‘dump’  
Can anybody provide assistance with that?  
Thank you,  
Florian

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<div class="post-metadata">

**Author:** ![FloRiAn](https://avatars.discourse-cdn.com/v4/letter/f/898d66/32.png) [@FloRiAn](https://hub.mender.io/u/FloRiAn)\
**Post date:** [December 9, 2020, 4:15pm UTC](https://hub.mender.io/t/mender-binary-delta-generator-error-no-help-topic-for-dump/2965/2 "2020-12-09T16:15:08Z")

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Hello,  
okay let’s reply to my own post.

I had to use the mender-artifact in version 3.4.0.

The version I used before was 2.4.0 and thats too old.  
Florian