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Invalid Session ID found in SessionHeader

we have developed one salesforce app which is syncing to our web application(used to PHP technology),for that we have to create some soap web service apex classes.
we were using OAuth Authentication,when we are calling to this custom webservices from php we got the following error.

INVALID_SESSION_ID: Invalid Session ID found in SessionHeader: Illegal Session. Session not found, missing session key: 00Do0000000KoV6!AQUAQCtee76J4OeKpviDwrwQZ9ZI2QeWeTx9aogt4gVCX65h6i1pDArJt9C0x8V.7fjKto.wXSHbPi0W6uWGvkA9Ms7JJdj4
This is expected, it can happen if the session has expired and swept away, or if the user logs out, or if its just someone trying to hack in.

Earlier it's working fine.but now its the above error

its working in Package Org(Build Org),when we install the same package in other Enterprice Org its get above error.

can any one help us....
Have you tried re-authenticating after you install your package in Enterprise org?
Are you storing the session ids somewhere in your web app? maybe its using the one from your packaged org?