As in Audacity 2.x, this can happen:
That is: one has input two numbers and an error message tells you one - or both? - of them is wrong and . . does not tell which one. Clearly, this needs changing.
Also: the page on reporting bugs does not actually say, explicitly, what page one uses. (I worked it out after a while, but then failed -as usual - to manage to log into the seemingly horrible Bugzilla.)
Finally: I found some page - I am afraid I forget which - which contained a link for ‘reporting bugs by email’. The link, which was to this: https://www.audacityteam.org/#feedback, does not work properly.
Really finally: the ‘preview’ option for this post threw an error one of the times I used it, but perhaps the problem there is at my end.