As DelPiero commented, there cannot be any gap between the two jobs, and they should essentially be the same job.
Note that this "continuity" requirement only applies to the NOC you are claiming as your "primary NOC." - you need one year of full-time continuous employment in a skilled NOC.
Of course, to qualify, you will probably need more than one year of work experience, but it does not all have to be continuous - just one year.