File "C:\pain\test_runner\test_runner.py", line 394, in run
    t.runfunc(testMethod)
  File "C:\pain\test_runner\trace.py", line 253, in runfunc
    result = func(*args, **kw)
  File "596898.py", line 65, in runTest
    self.delete_recovery_point(self.agent_logon.host, recovery_point=self.get_backup_id("fff_slice_1"), expected=2)
  File "base.py", line 157, in delete_recovery_point
    ap.delete_backup(host, recovery_point, vault, archive_password)
  File "F:\AUTOTEST\test_case\rest_api\archive.py", line 83, in delete_backup
    slice_machine_id = recovery_point['ItemSlicesMachineID']
TypeError: string indices must be integers, not str