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Did you copy your workspace to a usb-stick with NTFS file system or zip file and back? The executable file flags get lost during this....

To solve this the easiest would probably be to rebuild your entire workspace. But delete the build and devel folders before because otherwise, if you did not make changes to the src files the build files will not be recreated.

i. e.

go to your workspace folder (the folder that contains src/ devel/ and build/ folders; where you called catkin_make)
run rm -r devel
run rm -r build
run catkin_make
run rosrun HelloWC HelloWC_node

and everthing should work again