Weird error message; please help!!!

java.io.InvalidClassException: DrawingCanvas; local class incompatible: stream classdesc serialVersionUID = -8511311069504091406, local class serialVersionUID = 90-4285921088278508
that was the error I got and I have no idea what it means. DrawingCanvas is a class I wrote and I don't think there is anything wrong with it but I don't know what the error means so can someone please help me.

http://developer.java.sun.com/developer/technicalArticles/Programming/serialization/
Check the section on version control

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Today I received an "Unable to verify SSL server pop.gmail.com" message on my Mail server. I transfer mail from gmail to Mail.
"Mail was unable to verify the identity of this server, which has a certificate issued to "pop.gmail.com". The error was:
The certificate for this server has expired.
You might be connecting to a computer that is pretending to be "pop.gmail.com", and putting your confidential information at risk. Would you like to continue anyway?"
In the lower box, it lists the Version, Serial Number, Issuer Name (which is from Zaire, Western Cape, and lists the organization as Thawte Consulting cc and other info, Subject name is Google Inc, common name is pop.gmail.com, then gives a Signature Algorithm, Parameters, etc.
It won't let me Copy and Paste so I have not hit the Continue button for concern of losing that info for reference.
I went to Help which instructed me to do the following:
I'm getting a certificate-related error message
If you get an error message with the word "certificate" in it, make a copy of the message and contact your Internet service provider (ISP) or network administrator. The error message may help them diagnose your problem.
If your mail server uses a self-signed Secure Sockets Layer (SSL) certificate, each time you open Mail you'll see an error message stating that the certificate is not valid. You can continue, but you'll see the same message every time you open Mail. To stop seeing this message, you can permanently accept the certificate.
To permanently accept a self-signed SSL certificate:
Click the Show Certificate button in the error message.
The certificate appears with a certificate icon in the upper-left corner.
Hold down the Option key and drag the certificate icon to the desktop.
Double-click the certificate icon on the desktop, and choose X.509 Anchors from the pop-up menu. Click Add.
The certificate is permanently accepted.
You must have permission to administer the computer for this procedure to work.
For information about encryption, click "Tell me more."
Instead of asking for the "580 Anchors" , it asked simply "Do you want to add the certificates from pop.gmail.com.cer to a keychain?"
I clicked "Add"
The pop.gmail.com certificate AND Thawte Freemail Member AND Thawte Personal Freemail certificates is now entered in my Keychain.
There are no dates listed under "Created" or "Modified" for those certs under Keychain.
IS THIS OK OR DO I HAVE A PROBLEM SINCE THESE THAWTE CERTS ARE LOCATED IN ZAIRE???
IF IT IS A PROBLEM, HOW DO I FIX/CHANGE/OK/DELETE/MODIFY, ETC. IT? PLEASE BE CLEAR.
CAN I/SHOULD I JUST DELETE ALL THREE/SOME OF THE CERTS NOW IN KEYCHAIN?
WILL I STILL BE ABLE TO GET MAIL AS BEFORE THIS MESSAGE IF DELETE THE CERTS?
I believe this is the first time I have received a message concerning certificates so I am naive concerning this.
THANK YOU.

I had similar gmail/cert problem yesterday - not for the first time!
I deleted the prefs (user/library/preferences), deleted the gmail account (mail prefernces), ran applejack ( http://applejack.sourceforge.net/ ) & added the account from scratch.
Annoying I know, and my inbox was 200+ emails but nobody seems to know what or why this happens (my previous post) http://discussions.apple.com/thread.jspa?threadID=243186&tstart=0
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ever been faced with the same problem ?
Why deleting ? It that only one way to fix this problem ?
What are the others doing in such cases. Or am I the only one person
where has this special problem on the world. Becides I dont believe
in solving the problem through removing mentioned directory and
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bye
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-----
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+The message I get 'attempting to copy to disk'new ipod' failed. An unknown error occured(-69)+
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Weird error message; please help!!!

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