Trying to switch from HTTPS to SSH. Getting the following exception after switching (changed the link for this post):

Fetching upstream changes from git@server:username/repository.git
using GIT_SSH to set credentials server ssh
FATAL: Failed to fetch from git@server:username/repository.git
hudson.plugins.git.GitException: Failed to fetch from git@server:username/repository.git
at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:623)
at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:855)
at hudson.plugins.git.GitSCM.checkout(GitSCM.java:880)
at org.jenkinsci.plugins.multiplescms.MultiSCM.checkout(MultiSCM.java:118)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1251)
at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:605)
at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:88)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:514)
at hudson.model.Run.execute(Run.java:1703)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:231)
Caused by: hudson.plugins.git.GitException: Command "git fetch --tags --progress git@server:username/repository.git +refs/heads/master:refs/remotes/origin/master" returned status code 128:
stdout:
stderr: 'C:\Program' is not recognized as an internal or external command,
operable program or batch file.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1276)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:1146)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$200(CliGitAPIImpl.java:87)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$1.execute(CliGitAPIImpl.java:254)
at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:621)
... 11 more