It might be that you are developing the Customized Content Deployment job for Export and Import of the Contents between different Web applications. So, it could be export is not performed properly or perhaps export failed during the job execution. There also might be dependency between different jobs.
I would recommend you to take following actions:
If you are working with Import and Export Timer jobs, then try to increase the span of Export timer job from 5mins to 10 mins. Let import run to be run in short durations for e.g. 2mins. Then start debugging the code.
For debugging: Its very important here to attach debugger with "Owstimer.exe" process in Visual studio to help debug the code of affected Timer Service. Make sure that you set breakpoints in the code. Also make sure you reset SharePoint Timer Services after you done with Timer job deployment
You can execute these in cmd:
net stop "Windows SharePoint Services Timer"
net start "Windows SharePoint Services Timer"
Good luck