I try by removing the Compression module in Web.config HttpModules section.  It can't solve  WebForm_PostBackOptions is undefined

WebForm_PostBackOptions and webresource.axd Problem Solution for DotNetNuke

We describe here the solution for the WebForm_PostBackOptions Problem in DotNetNuke what we have used and verified on over 20 Portal-Systems successfull.

Important before make changes:

Before you make changes on your portal please make a Backup from your portal and your database.

Important before update to DotNetNuke:

Make sure you have installed all latest version from your used modules how apollo (localization), Brind2Minds Document Exchange and others.

When you not make a update to the latest version of your used modules you become many errors after a upgrade. In hardest
situation you cannot more access to your portal.

Needed Steps:

1.Upgrade to DotNetNuke 04.05.00 or 04.05.01

When you used Compression then you need this followed additional Steps:

1.Goes to Host-Settings / Advanced Settings / Compression Settings
2.Write in Excluded Paths: webresource.axd
3.click on update

Warranty:

We cannot give you any warranty for that solution or results for changes hat you make on your portal system. We can give only our expierience back to this great community.

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I fixed this error by removing the blowery compression entries in the web.config.

But still getting an error about Type is undefined. It doesnt effect the site in anyway, just annoying having the warning symbol in the bottom of ie.