ValueError: Shapes (10, ?, 160) and () are incompatible

[pengcao]

I am using tensorflow=1.12.0 on win7 64. i am running into this error during training. thanks.
packages\tensorflow\python\framework\tensor_shape.py", line 848, in assert_is_compatible_with
raise ValueError("Shapes %s and %s are incompatible" % (self, other))
ValueError: Shapes (10, ?, 160) and () are incompatible