/home/user # cd .ca
.cache/ .calendar/
/home/user # cd .cache
/home/user/.cache # ls
launch tracker
/home/user/.cache # cd tracker/
/home/user/.cache/tracker # ls
db-version.txt
email-meta.db
file-meta.db
email-contents.db
file-contents.db
email-index.db
file-index.db

/home/user/.cache/tracker #

these are the new files in cache folder, i deleted the folder then i did the tracker code and hopefully it will work when i reboot my phone,