Issue with running this Pipeline Shared Library

GitTool.groovy

class GitTool extends StepsBase {

    def GitTool(steps) {
        super(steps)
    }

    def runSh(script, returnStdout = false) {
        def output = steps.sh(script: script, returnStdout: returnStdout)
        return output.toString()
    }

    @NonCPS
    def commitGitChanges(String path, String message, String gitEmail='sunflower@sunflower-build-bot.local', String gitName='sunflower-build-bot') {
        def git_cmd
        steps.dir(path) {
            runSh("git config --local user.email '${gitEmail}'".toString())
            runSh("git config --local user.name '${gitName}'".toString())

            runSh('git add -A')

            git_cmd = runSh("git commit --message '${message}'".toString(), true)
        }
        return git_cmd
    }

  
}

StepsBase.groovy

class StepsBase implements Serializable{
    def steps
    StepsBase(steps=null) {
        this.steps = steps
    }

    def log(message) {
        if (this.steps) {
            this.steps.println("${message}".toString())
        } else {
            println(message)
        }

    }
}