Installation error

I have tried to install Modx (installing it in a sub directory on the server just to try it out) and met all of the conditions in terms of chmod on the server for the assets/cache directory, database access etc. The server I am trying to install this on runs MySQL, PHP and Apache.

The install goes well until I receive the following error message:

"Fatal error: Cannot instantiate non-existent class: synccache in /home/fhlinux183/o/onlinepropertygroup.org.uk/user/htdocs/modx/install/instprocessor.php on line 470"

The full setup feedback I get is as follows:
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Setup will now attempt to setup the database:

Creating connection to the database: OK!

Selecting database `onlineprop`: OK!

Checking table prefix `modx_`: OK!

Creating database tables: OK!

Installing demo site: OK!

Writing configuration file: OK!

Chunks:

WebLoginSideBar: Upgraded

Module:

Doc Manager: Installed

QuickEdit: Installed

Plugin:

Bottom Button Bar: Installed

Forgot Manager Login: Installed

Inherit Parent Template: Installed

QuickEdit: Installed

TinyMCE: Installed

Search Highlighting: Installed

TemplateSwitcher: Installed

Snippets:

AjaxSearch: Installed

Breadcrumbs: Installed

Ditto: Installed

eForm: Installed

FirstChildRedirect: Installed

Jot: Installed

ListIndexer: Installed

MemberCheck: Installed

NewsPublisher: Installed

Personalize: Installed

UltimateParent: Installed

Wayfinder: Installed

WebChangePwd: Installed

WebLogin: Installed

WebSignup: Installed

Running database updates: OK!

Fatal error: Cannot instantiate non-existent class: synccache in /home/fhlinux183/o/onlinepropertygroup.org.uk/user/htdocs/modx/install/instprocessor.php on line 470
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Any suggestions, ideas or solutions welcome.

Thanks

Re-upload your files, as it appears some did not get transferred properly. Common problem, easily resolved...

Thanks, it worked I treat (in the process of discovering this, I also found that I needed a better ftp client...)