I got the very same error. And this is weird because I can commit from the command line or using any Git client. 

Alexandre

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Alexandre Bergel  http://www.bergel.eu
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On May 21, 2017, at 5:31 AM, Stephane Ducasse <stepharo.self@gmail.com> wrote:

On mac with latest pharo vm and latest pharo 60
Metacello new
    baseline: 'Bloc';
    load:#core

Then I got LGit_GIT_ERROR no ssh-agent suitable credentials found