AETL tool error

Hi ETL team,

I designed one complete mapping and once i run it, I get following error,

I tried all possibilities to minimize the mapping flow and this is the shortest one I can design for my goal,

Please change the directory for temporary files

www.etl-tools.com/wiki/aetle/processing_.../working_with_joiner

Thanks for the quick response.
But why we need to change the directory?
If this is because the storage capacity of the directory then what should be the storage capacity of one directory?
Now the by default C: directory is assigned to AETL It means I should select the path out of the C: directory?

But why we need to change the directory?

I assume this is because the directory is read-only

Okay, But why this problem again occurred to me after changing directory

I changed the location which has full permissions