hello, I have just started learning mathematica (v 12.1) following along the examples in the book ""hand on start to mathematica". Particularly the example on page 12.

I'm getting the following output instead of a numerical answer. I could disband and expand the plus icon perfectly fine and can see the answer (72.674 or some such), the problem is the initial output (output [1] = Missing["RetrievalFailure"]) where the numerical value should appear.

i have gone through the documentation, searched the internet and tried fiddling with different options on the software but didn't come across any answer, have tried to fix and on my own with no such luck.

I'm sure this is something really simple, any little help would be much appreciated. Sorry about the screen shot, it didn't come out the way i wanted. Hope its discernible enough. thanks.