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TJuly 0 Newbie Poster

I have 2 Pages (Listing and Entry) using Master Page.
Firstly I am in Listing page.
When click the 'New' button in Listing Page, I go to Entry page below.
Server.Transfer("~/Job/JobCodeEntry.aspx");
In the entry page, I use User Control for Multi FileUpload.

Whenever I upload, I got this err. Help me please.

Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

Best Regards,
TJuly.

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