gnokii exec problem on browser

[mikha]

Hi,

I have this php file which containns an exec() function for executing gnokii
commands. When I execute this php file in the command line, the gnokii
command gets executed. But if I try to execute the php file via the browser,
the gnokii command doesn't execute. Help please

I looked at the error_log file of apache I think, 
and this is what I get when I do 'tail /opt/lampp/logs/error_log'

Cannot lock device.
Lock file error. Exiting.
Cannot open logfile: Permission denied
WARNING: cannot open logfile, logs will be directed to stderr
GNOKII Version 0.6.12
LOG: debug mask is 0x1
Lockfile /var/lock/LCK..ttyS0 is stale. Overriding it..
Overriding failed, please check the permissions.
Cannot lock device.
Lock file error. Exiting.

any ideas? thanks

using ubuntu dapper drake and gnokii 0.6.12 installed via synaptic
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