Unable to reach some functions

Hi, I have installed Pear on my development computer under Windows by hand and all go on. But on the remote server I encoutenter errors on some pages, and I have no ideas where they come from: Fatal error: Call to undefined function: isconnection() in /usr/www/htdocs/path2pear/PEAR/Auth/Container/DB.php on line 133 and there was another one with the function compareDates() of Calc.php called via the package Validate. I try to install with the use of go-pear.php. This tool seems to be wonderful, but this did'nt solve my problem, and add a new: I can't install the package Validate, it isn't availbale. And, I can't install it by hand because I don't have the rihts in the PEAR directory created and I can't change them (cf.my post PEAR Installer pbs..). However the package Auth is "well" installed, and the others needed too (only the package Validate is needed on some pages and isn't installed), but as I said previously this didn't solve my problem. Any ideas? Thanks,