Umpqua

It looks like it was a conflict with the WordSocial plugin.

I upgraded your app to 1.1.1 and still got that error when I tried to activate it.
After I deactivated WordSocial I was able to activate your app.
Then after your app was activated, I was able to reactivate WordSocial.

In the end I disabled WordSocial as I wasn’t really using it anyway.

OK, I see it.

The readme.txt needs to be updated.

I figured this out.

Replace:
$post_content .= $item['text'];

With:

$find_links = $item['text'];
$linkified_text = ereg_replace(":alpha:+://[^<>[:space:]]+[[:alnum:]/]","<a href=\"\\">\</a>", $find_links);
$post_content .= $linkified_text;