I am having trouble adding hosts 

root@Observium:/opt/observium# ./add_device.php sun.solar.lan public v2c
Observium v0.14.4.5229
Add Device(s)

Try to add sun.solar.lan:
Trying v2c community public ...
No reply on community public using v2c.

Could not reach sun.solar.lan with given SNMP community using v2c.
Devices skipped: 1.

NOTE i know form the docs that hostnames are important so i thought i would send this info too

nslookup sun.solar.lan
Server: 10.0.0.110
Address: 10.0.0.110#53

Name: sun.solar.lan
Address: 10.254.254.254

Computer King                   CaN-Mail                    Surveillance King
http://computerking.ca     http://canmail.org      http://surveillanceking.net

Surveillance - Sales Service - Hosting Backup
Internet Based Surveillance Systems
Custom Service Pac kages
Secure IMAP Email - Automated Remote Backups - Photo Blogs - Online ERP and Accounting Packages

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Mike Stupalov
http://observium.org