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Don SkipperDon Skipper 

Web service callout failure: unable to find apex package

Today I received the following error after editing the endpoint url in my apex class:

System.CalloutException: Web service callout failed: Unable to find Apex package

I got this error once before and burned an entire day attempting every viable solution i found on these forums.  Nothing worked.  The next day i tested the solution and everything immidiately worked as it should.  So my question: Is this a salesforce issue that pops up its annoying head every once in awhile or is there something about apex classes which i am not fully understanding?  And if it is due to my lack of understanding, can someone point me the way to greater enlightenment?
Don SkipperDon Skipper
I have viewed these solutions already and none of them resolved the issue.