Layerblend Arithmetic Between Types foat1 and float 2 are undefined

[anonymous_user_77e573431 (anonymous_user_77e57343)]

Im trying to make some layers and layerblend shows this problem when i add a value on preview weight

[anonymous_user_00ca31f9]

be sure that you are connecting the alpha node (it is a simple A in texture sample ) to the layer blend and not the RGBA node!