messed up portage.

[vod]

Hey i've messed up portage. I did a bootstrap.sh now it doesn't work.
bails out like this:
emerge portage
Calculating dependencies \Traceback (most recent call last):
File "/usr/bin/emerge", line 1259, in ?
if not mydepgraph.create(mytype+" "+portage.root+" "+mykey,None,"--onlydeps" not in myopts):
File "/usr/bin/emerge", line 410, in create
edepend=portage.db[myroot]["porttree"].dbapi.aux_get(mykey,portage.auxdbkeys)
File "/usr/lib/python2.2/site-packages/portage.py", line 2565, in aux_get
self.auxcache[mycpv][auxdbkeys[x]]=mylines[x][:-1]
IndexError: list index out of range

or when i try update world:
# emerge -up world

These are the packages that I would merge, in order.

Calculating world dependencies |Traceback (most recent call last):
File "/usr/bin/emerge", line 1227, in ?
if not mydepgraph.syscreate(getworldlist()):
File "/usr/bin/emerge", line 513, in syscreate
if not self.create(self.match(myline,mykey="update (likely old /var/db/pkg entry)")):
File "/usr/bin/emerge", line 466, in create
if not self.create(mynew,mybigkey):
File "/usr/bin/emerge", line 410, in create
edepend=portage.db[myroot]["porttree"].dbapi.aux_get(mykey,portage.auxdbkeys)
File "/usr/lib/python2.2/site-packages/portage.py", line 2565, in aux_get
self.auxcache[mycpv][auxdbkeys[x]]=mylines[x][:-1]
IndexError: list index out of range

How can i fix it?