CakePHP unable to write to certain files
As Wooble points out the app/tmp folder needs to be writeable by your webserver user.
To correct the other two errors you should edit the app/Config/core.php file as suggested in the errors. Cake ships with default values which should be changed so that not every Cake project has the same security values. If you open that file you will see instructions in the comments.
If you're new to Cake then have a look at the tutorial on the manual site http://book.cakephp.org ...
Ensure you has folder: app/tmp/
and have the sub folder structure like:
tmp/
--/cache
--/logs
--/sessions
--/tests
Then, check the web users' permission on these folder.
This directory: /Applications/XAMPP/xamppfiles/htdocs/evolvidsnew/app/tmp/cache needs to be made writeable by whatever user ID your webserver is running under. You don't specify which OS you're on, so can't tell you how to do that specifically.