WebGL: INVALID_OPERATION: texImage2D: no bound PIXEL_UNPACK_BUFFER – Mipmap

I just wanna make mipmap from texture(png image). Texture works fine but mipmap not generated.

WebGL: INVALID_OPERATION: texImage2D: no bound PIXEL_UNPACK_BUFFER – Mipmap

I just wanna make mipmap from texture(png image). Texture works fine but mipmap not generated.