When i want to create workspace it give me an error [closed]

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Hi everyone!

I try to set up my workspace for ROS Lunar, but when i run the comand rosws set ~/fuerte_workspace/sandbox it give me this error: ERROR in config: Command requires a target workspace.

I followed the steps in the tutorial on ROS.ORG site.

After that I tried Catkin instead of rosbuild. The comands i entered are in this order:

1. mkdir -p ~/catkin_ws/src

2. cd ~/catkin_ws/

3. catkin_make

After this point i get the next error:

####
#### Running command: "cmake /home/ovidiu/catkin_ws/src -DCATKIN_DEVEL_PREFIX=/home/ovidiu/catkin_ws/devel -DCMAKE_INSTALL_PREFIX=/home/ovidiu/catkin_ws/install -G Unix Makefiles" in "/home/ovidiu/catkin_ws/build"
####
-- Using CATKIN_DEVEL_PREFIX: /home/ovidiu/catkin_ws/devel
-- Using CMAKE_PREFIX_PATH: /opt/ros/lunar
-- This workspace overlays: /opt/ros/lunar
-- Using PYTHON_EXECUTABLE: /home/ovidiu/anaconda3/bin/python
-- Using Debian Python package layout
-- Using empy: /usr/bin/empy
-- Using CATKIN_ENABLE_TESTING: ON
-- Call enable_testing()
-- Using CATKIN_TEST_RESULTS_DIR: /home/ovidiu/catkin_ws/build/test_results
-- Found gmock sources under '/usr/src/gmock': gmock will be built
-- Found gtest sources under '/usr/src/gmock': gtests will be built
-- Using Python nosetests: /home/ovidiu/anaconda3/bin/nosetests
CMake Error at /opt/ros/lunar/share/catkin/cmake/safe_execute_process.cmake:11 (message):
  execute_process(/home/ovidiu/anaconda3/bin/python
  "/opt/ros/lunar/share/catkin/cmake/parse_package_xml.py"
  "/opt/ros/lunar/share/catkin/cmake/../package.xml"
  "/home/ovidiu/catkin_ws/build/catkin/catkin_generated/version/package.cmake")
  returned error code No such file or directory
Call Stack (most recent call first):
  /opt/ros/lunar/share/catkin/cmake/catkin_package_xml.cmake:74 (safe_execute_process)
  /opt/ros/lunar/share/catkin/cmake/all.cmake:163 (_catkin_package_xml)
  /opt/ros/lunar/share/catkin/cmake/catkinConfig.cmake:20 (include)
  CMakeLists.txt:52 (find_package)


-- Configuring incomplete, errors occurred!
See also "/home/ovidiu/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/ovidiu/catkin_ws/build/CMakeFiles/CMakeError.log".
Invoking "cmake" failed

I also want to mention that i had anaconda3 installed but I uninstalled it.

If someone could help me i would be grateful.

Thanks!