Cancel the build and try the command
and if the same freeze occurs then the problem is most likely within the namelist definition file (
user_nl_cam). Make sure all the commas and quote marks are there. Sometimes, if the
user_nl_cam file has been opened in Notepad or another text editor, auto-formatting can change the formatting of some symbols, such as quote marks (e.g. Word automatically changes straight quote marks to curly quote marks).