Cache errors on Heroku with update to 2.3 but works fine on local?

I just updated my cake application to 2.3 and I started getting internal errors on my heroku application.

Warning (512): /app/www/app/tmp/cache/ is not writable [CORE/Cake/Cache/Engine/FileEngine.php, line 336]

Warning (2): file_put_contents(/app/www/app/tmp/logs/error.log) [http://php.net/function.file-put-contents]: failed to open stream: No such file or directory [CORE/Cake/Log/Engine/FileLog.php, line 88]

This works fine on my local server. Any tips?

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