I have the exact same problem on my blog, I managed to make it post the link to the blog post a couple of times but normally it simply prints out that error message.
Out of curiosity, which hosting provider are you using? I’m with 000webhost, and I’ve noted that they have a noticeable lag when accessing PHP functions (for instance, I couldn’t update my WordPress installation using the automated installer – I had to do it manually because the automated installer would just give up and not proceed!).