When you get an error with an Oracle DBMS_ package, there's a line number given to be able to troubleshoot. However, most of them are wrapped to have their code compact, with comments stripped, when loading it in the dictionary. Opening the file with a CREATE OR REPLACE PACKAGE BODY shows only random printable characters:

To troubleshoot an error, you can get the PL/SQL code back easily in order to check the line where you got an error.

There's a plugin for SQL Developer:

An online site can also do it online: https://www.codecrete.net/UnwrapIt/

Here is a small script that writes the code from all *.plb in the $ORACLE_HOME to a .unwrapped one:

export PATH=$PATH:$ORACLE_HOME/python/bin
pip install html2text
for f in $(grep -l ' wrapped *$' $(find $ORACLE_HOME -name "*.plb"))
do
 curl -s -F "file=@$f" -F "ShowLineNumbers=false" -F "UnwrapFile=Unwrap File" https://www.codecrete.net/UnwrapIt/ |
 html2text | awk '
/Unwrap More Code/{p="Y";next}
/Bleichenbacher/{print "--",$0;next}
p=="Y"{gsub(/ʼ/,qq);print}
' qq="'" > ${f}.unwrapped && wc ${f}.unwrapped
done

This is to run on only in a lab, why not a container started from Oracle 23c Free edition (docker run container-registry.oracle.com/database/free), and is for educational purpose only. Nothing is encrypted when wrapped, but that doesn't give you any right on the code. This is not Open Source!