It's recommended that you are very careful with auto-submission sites...shortcuts like that provide very little useful results any more.
The submission errors could be an indicator of that, as Search Engines are probably adjusting their submission guidelines and processes...and the auto-submission softwares simply don't keep up with the latest.
Just for the newbies here that may not know it's best NOT to use submission software or even hand submit.
Google is the main engine that counts and SHE PREFERS to find links herself rather than have them submitted. All the search engines will NATURALLY pick up your site if you just get a few good related inbound links from other sites that are spidered regularly. This is easy to do and the bonus is you may get some traffic from those inbound links in addition to leaving a trail for the spiders to follow to find your site.
__________________ Linda Buquet :: Affiliate Recruiting, Promotion & PR
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Word up Linda. Those dang auto-submissions create the illusion that it "can be so easy" to get noticed online...when in fact the long-term will be better served by doing things "the hard/right way".
its better that you do ur promotion so that u can monitor it. and you can have alot of options. everything is very simple in submitting your site to a search engine and directories.
Automated submission just does not help at least that's my opinion
No point in having a thousand links to your webpages all saying the same thing [could actually hurt your SERP ranking] or submitting the same article to 200 article directories
Hand submit your articles is the way I tend to do it and seems to have reasonable results
I agree with all the above comments. Nothing beats hand submitted your website yourself. The only 4 that really count nowadays is MSN Site Explorer, Yahoo, DMOZ, and of course Google.