ORA-01115: IO error reading block from file (block # ) (4256835)

Getting "qsa not running error" and the qexecd.log file shows an issue on this database, it reports an ORA-01115: IO error reading block from file (block # ).

Cause: an attempt was made to open a file that exceeds the process's file size limit (ulimit), additional information shows the current
limit (logical blocks) and the size of the file (logical blocks)

Action: increase the processes file size limit (ulimit) and retry

Command to check the ulimit value
Unix command Prompt> ulimit -a
Result
time(seconds) unlimited
file(blocks) 564136
data(kbytes) 26561
stack(kbytes) 8756
memory(kbytes) 7668
coredump(blocks) 2056151
nofiles(descriptors) 2000