If I read this correctly you're trying to access the dashboard of your wp-admin, but the error you have created is preventing this? or have you just plain forgotton your admin password.
Really what you need to do is:
Use cyberduck to get access to your website. FTP access will have different usernmes and password to your wp-admin. If you don't have your FTP username and password your host provider will be able to tell you this - normally you can get details via your host's admin panel
Then go into wp-content/themes and rename the folder caepoa to caepoaold.
This will force wordpress to use a default theme, so your error will disappear, and your site and wp-admin access will be back. If you have forgotton your WP-password you can then use lost password to reset it.
Having done all that, you can then edit your themes functions file to correct the error you created, rename the dorectory back to caepoa, switch back to that theme and you'll be back and working