Build failure

[Maithilishetty]

Hi, I ran all the commands as per the readme file but couldn't seem to resolve this issue. My builds are failing due to a symlink error. Only 3/9 packages are successfully installed. It would be great help if you could tell me how to fix it!

This is the error message:

Errors << polygon_coverage_solvers:symlink /home/maithili/polygon_ws/logs/polygon_coverage_solvers/build.symlink.020.log
Could not create symlink /home/maithili/polygon_ws/devel/lib/System.Native referencing /home/maithili/polygon_ws/devel/.private/polygon_coverage_solvers/lib/System.Native
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/catkin_tools/execution/stages.py", line 174, in function_proxy
return function(logger, event_queue, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/catkin_tools/jobs/catkin.py", line 308, in link_devel_products
os.symlink(source_file, dest_file)
OSError: [Errno 17] File exists

Stage symlink failed with arguments:
package: {'buildtool_export_depends': [], 'test_depends': [], 'exec_depends': [Dependency(name='rosconsole', evaluated_condition=True), Dependency(name='roslib', evaluated_condition=True)], 'build_depends': [Dependency(name='rosconsole', evaluated_condition=True), Dependency(name='roslib', evaluated_condition=True)], 'licenses': ['GPL'], 'group_depends': [], 'doc_depends': [], 'filename': '/home/maithili/polygon_ws/src/polygon_coverage_planning/polygon_coverage_solvers/package.xml', 'version': '0.0.0', 'package_format': 2, 'exports': [], 'description': u'Solvers for the underlying graph optimization problems.', 'build_export_depends': [Dependency(name='rosconsole', evaluated_condition=True), Dependency(name='roslib', evaluated_condition=True)], 'maintainers': [<catkin_pkg.package.Person object at 0x7f9b3a1dbfd0>], 'member_of_groups': [], 'authors': [<catkin_pkg.package.Person object at 0x7f9b3a466090>], 'conflicts': [], 'buildtool_depends': [Dependency(name='catkin', evaluated_condition=True), Dependency(name='catkin_simple', evaluated_condition=True)], 'version_compatibility': None, 'replaces': [], 'name': 'polygon_coverage_solvers', 'urls': []}
metadata_path: /home/maithili/polygon_ws/.catkin_tools/profiles/default
devel_manifest_path: /home/maithili/polygon_ws/.catkin_tools/profiles/default/packages/polygon_coverage_solvers
prebuild: False
package_path: polygon_coverage_planning/polygon_coverage_solvers
dest_devel_path: /home/maithili/polygon_ws/devel
source_devel_path: /home/maithili/polygon_ws/devel/.private/polygon_coverage_solvers