I try to do a projection painting and I followed a tutorial, but I get a 'Missing Data' warning in the tool shelf:

How do I solve this? This is what I want to achieve (picture of the tutorial):

Thank you
I try to do a projection painting and I followed a tutorial, but I get a 'Missing Data' warning in the tool shelf:

How do I solve this? This is what I want to achieve (picture of the tutorial):

Thank you
To paint on the model you need to create a texture in the material.
Click on Add Paint Slot and select Diffuse Color. This will create a texture that will have Color influence on the material in Blender Internal, and if you are in Cycles Render it will add a texture node on the material.

Make sure you don't have Use Nodes checked in your Node Editor window. This should let you paint in the 3D Viewport. I had the same problem and this worked for me.
Image Editorwhich then apply for that texture. Also it might be a good idea to include link to the lesson you use. – Mr Zak Jun 04 '15 at 12:05