Hi @nunorsr
The HTTP error 500 is a server side error and generally there isn’t much we can do about it, but wait until it’s fixed on their side. Check out this answer for a possible retry mechanism.
However, the error message you get carries an important piece of information.
Since you noticed that the scenario was running fine and this started to happen after a while, I believe this is one of those “time-bomb” issues, where things go well in the beginning and tend to fail when the volume of data grows. The error message kind of confirms that.
Also, since you’re watching posts on a page, that assumption makes sense, since the number of posts tends to increase over time without your control.
This, use the limit field to retrieve a smaller number of posts. As an alternative, combine that with right clicking the module and selecting “Choose where to start” to restrict the results even further.