File / folder error

Hello got a sketch and have this error .

Build options changed, rebuilding all
NewVendingMachine3_8.ino:4:31: fatal error: LiquidCrystal_I2C.h: No such file or directory
compilation terminated.
Error compiling.

what do i wrong ´?

Thanks

NewVendingMachine3_8.ino (28.9 KB)

Have you installed the LiquidCrystal_I2C library?