arduino nano obstacle avoiding rover sketch

newping.h: no such file or directory
what the problem?

asuvro28:
newping.h: no such file or directory
what the problem?

The problem is that you did not read the recommendations for posting here (and you did not install the newping library probably, or with the wrong capitalization)

asuvro28:
newping.h: no such file or directory
what the problem?

You haven't installed or referenced the NewPing library correctly.