I'm a new user of SS, I absolutely love it.
Until now, I've used SS on my localhost with wamp, no problems whatsoever, nothing to complain. But... the time has come to put my website on the web, using the simple method of FTP transfer with a clean install... and here comes the problem! I've searched through this forum, but nothing helped me so far.
In the browser's title bar I have: PHP 5 is required

The error is:

I am now running through the installation steps (this should take about 30 seconds)

If you receive a fatal error, refresh this page to continue the installation

* Creating 'mysite/_config.php'...
* Creating /home/hosting/savy/mysite/_config.php
* Creating '.htaccess' file...
* Creating /home/hosting/savy/.htaccess

Fatal error: require_once() [function.require]: Failed opening required '/home/hosting/savy/silverstripe-cache/manifest-main' (include_path='.:/usr/local/lib/php') in /home/hosting/savy/sapphire/core/ManifestBuilder.php on line 70

In ManifestBuilder, that line is: require_once(MANIFEST_FILE);

Note: I cannot change mod to 777 on silverstripe-cache (using SmartFTP). I saw that this might me a solution, but not for me.

Any help?

I've tried to set the memory limit to 48 MB, on the web server I have 300 MB of space (or 500, I'm not really sure). I will try on another server... just to be sure and to compare the differences. Thank you for your suggestion.