Validation of viewstate MAC failed

I have hosted my application on shared server. And its working fine. But when i leave the page idle for about 20 minutes or so and then click any button then i got this error.
"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. "

I didnt used any viewstate in the page. And i also had only one FORM tag in the page.
I have tried to put the "EVENTVALIDATION" to FALSE but it didnt work either.
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badalpatelAsked:
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jinalConnect With a Mentor Commented:
Hello ,

In page  directive of aspx page add EnableViewStateMac="false"

You get detail about viewstatemac at following link.

http://msdn.microsoft.com/en-us/library/system.web.ui.page.enableviewstatemac.aspx
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badalpatelAuthor Commented:
Hi, it didnt work either..When i leave my page idle for about 20-30 mins or so then the error appear again...
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badalpatelAuthor Commented:
Later on it did the trick
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