This part of the error output:
is telling you that it was not able to find a file named "Adafruit_AHT10" in any of the standard library locations.
The line of your sketch that produced this error:
This line is very unusual because the header files we use in these #include directives almost always have a .h file extension.
I see from the comment that you are basing this sketch on one of the examples of the "Adafruit AHT10" library. I recommend double checking to be sure that your code matches the code of the example.