Have you previous sessions stopped unexpectedly?
If positive it could leave a lot of garbage in your work library.
You need clear it, try by next code:
proc datasets lib=work; delete _ALL_; run;
alternatively use OS commands.
Afterwords enter a new sas session and run your programs.
If you still have disk space issue you can use same code, deleting specific temporary files
not used any more, like in:
data temp1;
set have;
...
run;
data temp2; /* or any proc creating temp2 */
set temp1;
...
run;
/* no need temp1 any more - delete it */
proc datasets lib=work; delete temp1; run;
etc.
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