How to solve the ora-12516 error

Hi,
I'm sorry to say that I have a problem which should be solved as quickly as possible. Can you help me ? The problem is as follows:
os:windows 2000
db version:Oracle Database 10g Express Edition』(XE)
After using for a while, the ora-12516 error occurs. However, scores of minutes later, the error can be solved automatically. How to avoid this kind of error ?
Thank you.

Are you connecting and disconnecting many times quickly?
You may be hitting the problem where the listener thinks the database has run out of connections because the database doesn't inform the listener that connections have been closed fast enough.
Try increasing the value of the processes parameter in the database.

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