How do I let my sprite touch the solid wall? (invisible space)

I'm working on a simple game where I have my controlled sprite with 8 tile movement and walls that have the behavior set to solid. Every time my sprite gets close to the wall there seems to be an invisible space between the sprite and the wall. I've tried editing the collisions for both sprites and nothing has worked. How do I fix this? Please help.

I have attached a screenshot of the space between the sprites.

If you are using the New Tile Movement Behavior, it will only permit your sprite to go to whole grid spaces. So this would be the closest it could get before being in the same grid space as the solid block. If you wanted the grid spaces to be smaller you could change the size in the properties bar under grid width and grid height.