I tried your suggestions but it's still not working.

Here's my log file:

hildon-application-manager 2.0.2
apt-worker: Running 'dpkg --configure dpkg' to clean up the journal.
dpkg: parse error, in file `/var/lib/dpkg/updates/0000' near line 1:
field name `<?xml' must be followed by colon
-----
Installing omweather 0.19.4
dpkg: parse error, in file `/var/lib/dpkg/updates/0000' near line 1:
field name `<?xml' must be followed by colon
E: Sub-process /usr/bin/dpkg returned an error code (2)
apt-worker: Running 'dpkg --configure dpkg' to clean up the journal.
dpkg: parse error, in file `/var/lib/dpkg/updates/0000' near line 1:
field name `<?xml' must be followed by colon

It's strange that I am able to install it when booting from flash, but unable to install when booting from mmc.

omweather is not the only program affected, i can't install a lot of other programs also.