Error: There must be full space on the conveyor to put an item on it

I had a working conveyor system, which was at a height of 1m (Z axis)
I lowered all parts to 0.2 and now i get the following error between 2 parts.
Any clue to why this is happening?

the error is the following:
exception: ErrorEntryTransfer20526 has a range that extends too far to the end of the conveyor. There must be full space on the conveyor to put an item on it.

I removed some conveyors and i rebuilt the layout,
now it works...

Must have been something wrong with the entry points ...