sas schedule don't execute the entire programm sas 5.1

[a1b1]

hello to all,

i'm new to sas and working on sas 5.1

(i'm using a schedule that ran sas program)

There is a scheduling program (sas program schedule) that was working until recently
The program has been producing 7 files and currently it produces 5 files
When I run the program manually and not through the schedule all 7 files are created

I would be glad if you could explain in detail cause I do not know SAS Please be patient with me
Hopefully I explained clear enough  my issue 

Thanks to any assistant

[Reeza]

Check your log for errors.