Error when migrating repository cloned into workbench from file URL

git clone https://code.engineering.redhat.com/gerrit/bpms-assets-6.4.x

Moving built-in repositories to system space...
Moving system.git...
Moving datasets.git...
Moving plugins.git...
Finished moving built-in repositories.
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Found 2 user repositories:
        myreporepo
        repository1
Updating repository configurations with spaces...
Configuring repo [myreporepo] in space [myogrunit]...
Configuring repo [repository1] in space [example]...
Finished updating repository configurations.
Moving repositories into spaces...
Moving repo [repository1] into space [example]...
Moving repo [myreporepo] into space [myogrunit]...
Finished moving repositories into space.
Found 2 projects:
        repository1
        myreporepo
Migrating [repository1]...
Migrating [myreporepo]...
java.lang.RuntimeException
        at org.guvnor.structure.backend.repositories.git.GitRepositoryBuilder.createFileSystem(GitRepositoryBuilder.java:137)
        at org.guvnor.structure.backend.repositories.git.GitRepositoryBuilder.build(GitRepositoryBuilder.java:71)
        at org.guvnor.structure.backend.repositories.git.GitRepositoryFactoryHelper.newRepository(GitRepositoryFactoryHelper.java:83)
        at org.guvnor.structure.backend.repositories.git.GitRepositoryFactoryHelper$Proxy$_$$_WeldClientProxy.newRepository(Unknown Source)
        at org.guvnor.structure.backend.repositories.RepositoryFactoryImpl.newRepository(RepositoryFactoryImpl.java:64)
        at org.guvnor.structure.backend.repositories.RepositoryFactoryImpl$Proxy$_$$_WeldClientProxy.newRepository(Unknown Source)
        at org.guvnor.structure.backend.repositories.ConfiguredRepositories.reloadRepositories(ConfiguredRepositories.java:78)
        at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.jboss.weld.bean.proxy.AbstractBeanInstance.invoke(AbstractBeanInstance.java:38)
        at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:100)
        at org.guvnor.structure.backend.repositories.ConfiguredRepositories$Proxy$_$$_WeldClientProxy.reloadRepositories(Unknown Source)
        at org.guvnor.structure.backend.repositories.RepositoryCopierImpl.fireNewBranchEvent(RepositoryCopierImpl.java:160)
        at org.guvnor.structure.backend.repositories.RepositoryCopierImpl.copy(RepositoryCopierImpl.java:133)
        at org.guvnor.common.services.project.backend.server.WorkspaceProjectMigrationServiceImpl$Migrator.copyFromLegacyRepositoryToTheNew(WorkspaceProjectMigrationServiceImpl.java:121)
        at org.guvnor.common.services.project.backend.server.WorkspaceProjectMigrationServiceImpl$Migrator.copyModulesToRepositories(WorkspaceProjectMigrationServiceImpl.java:108)
        at org.guvnor.common.services.project.backend.server.WorkspaceProjectMigrationServiceImpl$Migrator.migrate(WorkspaceProjectMigrationServiceImpl.java:87)
        at org.guvnor.common.services.project.backend.server.WorkspaceProjectMigrationServiceImpl.migrate(WorkspaceProjectMigrationServiceImpl.java:73)
        at org.kie.workbench.common.project.cli.InternalMigrationService.lambda$migrateProjectsToIndividualRepos$1(InternalMigrationService.java:103)
        at java.util.ArrayList.forEach(ArrayList.java:1257)
        at org.kie.workbench.common.project.cli.InternalMigrationService.migrateProjectsToIndividualRepos(InternalMigrationService.java:100)
        at org.kie.workbench.common.project.cli.InternalMigrationService.migrateAllProjects(InternalMigrationService.java:76)
        at org.kie.workbench.common.project.cli.InternalMigrationService$Proxy$_$$_WeldClientProxy.migrateAllProjects(Unknown Source)
        at org.kie.workbench.common.project.MigrationTool.migrateAndExit(MigrationTool.java:155)
        at org.kie.workbench.common.project.MigrationTool.run(MigrationTool.java:93)
        at org.kie.workbench.common.project.MigrationTool.main(MigrationTool.java:61)
Caused by: java.lang.RuntimeException: org.uberfire.java.nio.fs.jgit.util.commands.Clone$CloneException
        at org.uberfire.java.nio.fs.jgit.JGitFileSystemProvider.createNewGitRepo(JGitFileSystemProvider.java:676)
        at org.uberfire.java.nio.fs.jgit.JGitFileSystemProvider.lambda$newFileSystem$2(JGitFileSystemProvider.java:557)
        at org.uberfire.java.nio.fs.jgit.manager.JGitFileSystemsManager.lambda$createFileSystemSupplier$0(JGitFileSystemsManager.java:105)
        at org.uberfire.java.nio.fs.jgit.manager.MemoizedFileSystemsSupplier.lambda$get$0(MemoizedFileSystemsSupplier.java:36)
        at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660)
        at org.uberfire.java.nio.fs.jgit.manager.MemoizedFileSystemsSupplier.get(MemoizedFileSystemsSupplier.java:35)
        at org.uberfire.java.nio.fs.jgit.JGitFileSystemProxy.getRootDirectories(JGitFileSystemProxy.java:199)
        at org.uberfire.java.nio.file.FileSystemMetadata.<init>(FileSystemMetadata.java:32)
        at org.uberfire.io.impl.AbstractIOService.registerFS(AbstractIOService.java:255)
        at org.uberfire.io.impl.AbstractIOService.newFileSystem(AbstractIOService.java:235)
        at org.guvnor.structure.backend.repositories.git.GitRepositoryBuilder.newFileSystem(GitRepositoryBuilder.java:144)
        at org.guvnor.structure.backend.repositories.git.GitRepositoryBuilder.createFileSystem(GitRepositoryBuilder.java:127)
        ... 26 more
Caused by: org.uberfire.java.nio.fs.jgit.util.commands.Clone$CloneException
        at org.uberfire.java.nio.fs.jgit.util.commands.Clone.execute(Clone.java:106)
        at org.uberfire.java.nio.fs.jgit.util.Git.clone(Git.java:91)
        at org.uberfire.java.nio.fs.jgit.JGitFileSystemProvider.createNewGitRepo(JGitFileSystemProvider.java:668)
        ... 37 more