Source -> LibGit2Sharp
Message -> unsupported repository version 1. Only versions up to 0 are supported.
Target -> Void HandleError(Int32)
StackTrace ->
at LibGit2Sharp.Core.Ensure.HandleError(Int32 result)
at LibGit2Sharp.Core.Ensure.ZeroResult(Int32 result)
at LibGit2Sharp.Core.Proxy.git_repository_open_ext(String path, RepositoryOpenFlags flags, String ceilingDirs)
at LibGit2Sharp.Repository.IsValid(String path)
at UnrealBinaryBuilder.Classes.Git.UpdateRepository() in C:\[redacted]\Unreal-Binary-Builder\UnrealBinaryBuilder\Classes\Git.cs:line 47
at UnrealBinaryBuilder.Classes.Git.get_CommitHash() in C:\[redacted]\Unreal-Binary-Builder\UnrealBinaryBuilder\Classes\Git.cs:line 15
...
Updating to this version seems to fix the problem: https://www.nuget.org/packages/LibGit2Sharp/0.27.0-preview-0158
See also https://github.com/libgit2/libgit2sharp/issues/1845