Fast path cache with URL Aliase problem

Hi,

I installed fast path cache module with URL aliases. It gives the following problem..

If i installed fast path cache module, some Warning messages came (like unlink(...).....permission denied in...). I have changed the folder permissions, but it's not resolved.

If i suppressed these Warning messages, URL aliases is working fine, but new content will be displayed to user side after a long period.

In user side, first time hover or click the link (for example About Us link), url aliases is not working. After clicked that same link it is working fine.

File cache gives warning message in My Account Link like,
warning: Missing argument 4 for fastpath_fscache_user() in C:\wamp\www\test_cache\modules\fastpath_fscache\fastpath_fscache.module on line 91.

And, Right now i just tested File cache with two modules only (like Internationalization and URL). But In future, i will integrate many modules. So, please tell me, In future, will Fast path cache affect any modules or not?

So, please give me some tips how to resolve it.

Thanks & Regards,
Karthikeyan