[TYPO3-english] Upgrade of 4.7.19 to 6.2.4

[Pero Peric]

Hi,

I just upgraded TYPO3 from 4.7.19 to 6.2.4 and in BE i can see page tree 
but if i click on some page i get blank right frame page. Anybody knows 
what's the problem? Thx.

regards.