Iceberg: LGit_GIT_ERROR: Invalid version 0 on git_remote_callback

I'm getting this error when trying to load my project into a fresh Pharo image using Iceberg:

LGit_GIT_ERROR: Invalid version 0 on git_remote_callback

Before loading my project I checked "Enable Metacelo Integration" and "Use custom SSH keys" in System > Settings > Tools > Software Configuration Management > Icegerg. Then I tried running the following Metacello script but it raised an error

Metacello new
    baseline: 'DataFrame';
    repository: 'github://PolyMathOrg/DataFrame';
    load.

Can someone tell me what this error message means and how to deal with it?

Image: Pharo 6.1 64-bit (https://pharo.org/download)
OS: MacOS High Sierra v.10.13.1

Solution

I have fixed this problem by updating Iceberg according to the instructions on GitHub:

MetacelloPharoPlatform select.
#(
    'BaselineOfTonel'
    'BaselineOfLibGit'
    'BaselineOfIceberg'
    'Iceberg-UI' 
    'Iceberg-Plugin-GitHub' 
    'Iceberg-Plugin' 
    'Iceberg-Metacello-Integration' 
    'Iceberg-Libgit-Tonel' 
    'Iceberg-Libgit-Filetree' 
    'Iceberg-Libgit' 
    'Iceberg' 
    'LibGit-Core'
    'MonticelloTonel-Tests'
    'MonticelloTonel-Core'
    'MonticelloTonel-FileSystem' ) 
do: [ :each | (each asPackageIfAbsent: [ nil ]) ifNotNil: #removeFromSystem ].
Metacello new
    baseline: 'Iceberg';
    repository: 'github://pharo-vcs/iceberg:v0.6.5';
    load.