lib Error: Implicit coercion of a value of type Boolean to an unrelated type Number.

[blackjyn]

well, I was able to fix the problem by edit the line from:
gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, true);
to
gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, 1);

System:
-Java 8
-Royale 0.9.6