LED display error messages.

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i purchased qunqi iic/i2c/twi 1602 serial blue backlight lcd module arduino uno r3 mega2560.  i'm trying use library drive i2c led uno r3 provided manufacturer.  i've installed library manufacturer going software , using add zip library.  the library shows in list.  but when try use in example sketch, error messages.  it indicated other users address needed changed.  the 1 comment was, "i work fmalpartida "new liquidcrystal" library here. https://bitbucket.org/fmalpartida/new-liquidcrystal/wiki/home
the address , wiring is:
#define i2c_addr 0x3f
and
liquidcrystal_i2c lcd(0x3f, 2, 1, 0, 4, 5, 6, 7, 3, positive);"

the unit has not arrived yet, , wanted start getting feel how work within software.  so software should compile without uno being connected computer.  can decipher error message means?  i don't understand this.  i'm new uno.  i've written , executed other programs.  this new project me.



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