piece size less than minimum required

[linmuqin]

Error:deal bafyreigetxgmgeesz4tqzacrjcfejthdr2lw4wze5wdwpd37ovrjbyvwpm failed: piece size less than minimum required size: 0 < 256

I made a deal following the instructions, but the piece size less than minimum required. What caused this？

[magik6k]

The file passed to lotus client import should have minimum size of 256b. We should fix the readme