python mcpi setBlockDistrib() don't work

[alice-in-the-wonderland]

Hi! Maybe I do something wrong, but this method doesn't work:
mc.setBlockDistrib(x, coords_y, z, 'DISPENSER','UP')

I get this error:
Last Message: <b'world.setBlockDistrib(9022,88,-231,DISPENSER,UP)'>
Drained Data: <b'Fail,Please check out minecraft server console\nFail,world.setBlockDistrib is not supported.\nFail,Please check out minecraft server console\nFail,world.setBlockDistrib is not supported.\nFail,Please check out minecraft server console\nFail,world.setBlockDistrib is not supported.'>

[alice-in-the-wonderland]

But it works fine als this:
mc.setBlockDir(x, coords_y + 2, z, 'OBSERVER', 'UP')
mc.setBlockDir(x, coords_y, z, 'DISPENSER','UP')

[alice-in-the-wonderland]

Thank you!