[TYPO3-dev] Class "tx_myext_pi1" did not exist

[Bartosz Aninowski]

Hi all
I have problem with generating content under alternative type page.
This is my rss page object.

rss= PAGE
rss {
typeNum = 333
config.disableAllHeaderCode = 1
#config.additionalHeaders = Content-type:text/xml // hashed for testing
config.admPanel = 1 //enabled for testing
#config.xhtml_cleaning = 0
#config.metaCharset=utf-8

22 = USER_INT
22.userFunc = tx_myext_pi1->generate_rss

}

empty output
and admin panel shows "Class "tx_myext_pi1" did not exist "

but If I create temp.test object and copy to subparts.rss and open page with 
type=0 everything is working as it should.

temp.test = USER_INT
temp.test {
userFunc = tx_myext_pi1->generate_rss
}

subparts.rss< temp.test

any idea what i am doing wrong?