ERROR in V3 after inputting map from Wilbur. Help please

[CombatComm]

I am new to this mapmaking thing and I will say it is EXTREMELY intimidating how complex it is. But I am determined to learn. I used one of the old arma mapmaking tutorials floating around on the forums but ran into an issue when I went to go into the bulldozer with my map from wilbur (my terrain editor) into V3. It is in 16bit PNG and it said something to the effect of something "is not a power of 2" I forgot the first part and im at wor, but does anyone know about this error and what it could be? Thanks!

[.kju [PvPscene]]

Your png texture needs to be a power of two as it says.
Like 2x2, or 2048x2048.

[CombatComm]

hmm I see and how would I do that? When I save my file as PNG or?

[.kju [PvPscene]]

well png or tga i guess. the texture needs to be power of 2.