[Observium] Simple API calls fail

Hello list,

After an upgrade recently, our Simple API calls have been failing. I just updated to latest svn 0.14.8.5732 and here is what I am seeing:

sample api call:

wget -O - " http://myserver/api.php?username=myuser&password=mypass&module=bandw... "

which returns:

HTTP request sent, awaiting response... 500 Internal Server Error

When adding debug=1 option, I get a lot of output which I have pasted here: http://pastie.org/private/zulxpk1n4viyyymxw89wjg

The relevant bit seems to be:

Fatal error: Call to undefined function humanize_device() in /opt/observium/includes/common.inc.php on line 964

Any tips for how to debug this?

Best,

Mark