Phaser Tiled map importing

You're probably referring to this:

    // May be fractional values
    var rowCount = (imageHeight - this.tileMargin * 2 + this.tileSpacing) / (this.tileHeight + this.tileSpacing);
    var colCount = (imageWidth - this.tileMargin * 2 + this.tileSpacing) / (this.tileWidth + this.tileSpacing);

    if (rowCount % 1 !== 0 || colCount % 1 !== 0)
    {
        console.warn("Phaser.Tileset - " + this.name + " image tile area is not an even multiple of tile size");
    }

• It's not a requirement, it's only a console warning
• If you inspect the code carefully (rowCount % 1), what it's trying to do is actually check that the tileset dimensions is divisible by the tile size, and not about "even numbers", i.e. divisible by 2

So for example, if your tile size was 32x32 and your tileset image was 64x64, that's ok (32 divides into 64), but if the tileset image was 65x65, that's 1px left over and 65 doesn't divide evenly into 32.