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Ext4 causes a kernel panic

I use kernel 2.6.28.2 and the funny thing is that yesterday the whole system worked fine.
After i reinstalled gentoo on my system and recompiled the kernel i get a kernel panic.

Code:

VFS: Cannot open root device "sda1" or unknown-block(8,1)

Please append a correct "root=" boot option; here are the available partitions:

0800    156290904  sda driver: sd

  0801      51761398 sda1

  0802        192780 sda2

  0803            1 sda3

  0805      5205028 sda5

  0806      98928238 sda6

0b00      1048575 sr0 driver: sr

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1)

This is my partition layout:
/dev/sda1 / ext4
/dev/sda2 /boot ext2
/dev/sda5 swap
/dev/sda6 /home

Ext4 support is enabled in the kernel and i added rootfstype=ext4 in grub.
I also formatted the sda1 partition to ext4 again, could this be the cause.
NOTE: I used a Xubuntu 9.04 Alpha 2 disk to install gentoo and it is able to mount /dev/sda1.

It seems i forgot the essential rule of the kernel:everything that's vital to booting shouldn't be a module. EXT4 was a module, but i fixed that, recompiled the kernel and now it works like a charm.

Good to see you fixed it. I would re-state your rule as - when you do a custom kernel, why use modules at all ?.
Especially something like gentoo.