moveit python api

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I am writing a code to move a robot arm using MoveIt Tutorials and moveit_commander.move_group.MoveGroupCommander Class Reference . However facing some problem in understanding that how can I move the robot at a specific (x,y,z) from base. My arm is moving but not to the specific place like x=50cm, y=50cm, z=50cm , and there is error

Fail: ABORTED: No motion plan found. No execution attempted.

whenever I am trying different position even if it is near to the robot. I think I need to know how to put input in meters from base coordinate frame and there is some relation between set_goal_tolerance(val) and pose_goal.position for reference I am attaching my code

import sys
import copy
import rospy
import moveit_commander
import moveit_msgs.msg
import geometry_msgs.msg
from math import pi
from std_msgs.msg import String
from moveit_commander.conversions import pose_to_list


moveit_commander.roscpp_initialize(sys.argv)
rospy.init_node('move_group_python_interface_tutorial',anonymous=True)

robot = moveit_commander.RobotCommander()
scene = moveit_commander.PlanningSceneInterface()
_commander = moveit_commander.move_group.MoveGroupCommander('xarm{}'.format(6))
display_trajectory_publisher = rospy.Publisher('/move_group/display_planned_path',moveit_msgs.msg.DisplayTrajectory,queue_size=20)



planning_frame = _commander.get_planning_frame()
print("============ Reference frame: %s" % planning_frame)
eef_link = _commander.get_end_effector_link()
print("============ End effector: %s" % eef_link)


group_names = robot.get_group_names()
print("============ Robot Groups:", robot.get_group_names())

print("============ Printing robot state")
print(robot.get_current_state())
print ("")


current_pose = _commander.get_current_pose(end_effector_link='link6').pose

print(f"The current pose is {current_pose}")

pose_goal = geometry_msgs.msg.Pose()

pose_goal.orientation.w = 1
pose_goal.position.x = 1
pose_goal.position.y = 1
pose_goal.position.z = 1

print(pose_goal)
_commander.set_pose_target(pose_goal)
_commander.set_goal_tolerance(1)

rospy.loginfo("Planning Trajectory to Pose 1")
plan1 = _commander.plan()
rospy.loginfo("Done Planning Trajectory to Pose 1")
rospy.loginfo("Executing Trajectory to Pose 1")

success = _commander.go(wait=True)

rospy.loginfo("Done Executing Trajectory to Pose 1")
_commander.stop()

_commander.clear_pose_targets()