URGENT: Code not working for various reasons

[Reed501]

So this morning's been long, at 9 AM I was told to come in to "fix the code" immediately I came across an error where, even after deploying, the driver station said "No Robot Code".

So I copied last year's code and edited it to this year's code. Then whenever I built the code it would just load the old code and our new code couldn't be built.

Then I made a new project and put the new code in and that gave me the original problem; the last year's code was built again.

After manually editing the old code directly and uploading that on the robot, it seemed as though the code ran only once and didn't loop.

I tried to change the properties and the target file of the project but they didn't help either.
Is there anybody who knows what to check??