ORA-06508,ORA-06512, why I should re-connect and after that it runs well?

Question

I have 2 package.
package A depends on B.
I call the package A in c++ code. At the begining, all work well.
I compile package B successfully.
But when I call package A in c++ code using a existing connection to the oracle, I get
ORA-06508: PL/SQL:
ORA-06512: 在 "PARTY.PKG_TRANSACTION", line 102
ORA-06512: 在 "PARTY.PKG_CFMMC", line 1186
when I kill this session in database server side and re-connect to the database, it runs well.
what is wrong, why I should re-connect and then it runs well, and in the mean time, it does raise errors above if I use the old connection?

Answer 1

It appears sometimes. But sometimes it does not appear.
you can create 2 package.
package a, package b.
A depends on b.
You can call the package A in the client side using c++ code.
then compile the b(do not change and code of b, just recompile it) successfully.
If you are lucky you can see the errors.