Every day, we see the frustration
It says there's something wrong and I should give this "error code" so Blogger can fix it. What should I do? Where can I send the "error code"?
When you get a bX code, there's not a lot you can do, to directly diagnose the problem.
Excepting for diagnosing bX codes related to custom domain issues, your first step is to use Google Search, and target the complete code
bX-sp4hmmThen see if someone else has reported that exact same code
After you use Google Search, you can help narrow down the problem - and maybe encourage other people to do the same.
You can identify which portion of your Blogger activity contributes to your observation of any specific bX code, using affinity analysis and / or differential analysis.
Neither affinity analysis or differential analysis will necessarily fix a bX code - though a side effect of differential analysis may be to temporarily "fix" one or more symptoms (change enough details, and some symptoms will go away). Most bX codes represent problems that originate deep within the Blogger code base. It may, though, help Blogger Engineering to identify the source of the problem.
Your details, added to similar reports by other blog owners, could make the difference between a problem that gets fixed in a couple weeks - or in a couple hours.