renumber error:Zero-sized mapping is not allowed

[sophia-xll]

Hello everyone,
I want to renumber several osm files. When renumber the first osm after sorted ,everything works well ,the command is 'osmium renumber -i. -o a_renumber.osm a_sort.osm'. When renumber 2th osm after sorted in the same directory, like 'osmium renumber -i. -o b_renumber.osm b_sort.osm'.Error occurs 'Zero-sized mapping is not allowed'.
The 2th osm was downloaded from Mappzen website with 490M size. The 1th osm was created myself with 40G size.
What can I do to renumber osm files one by one ?Thanks for any help.

[sophia-xll]

Is this error because of 0KB relation.idx ?

[joto]

@sophia-xll Yes, this is the problem. Should be fixed now, but you need newest libosmium and osmium-tool master.

[sophia-xll]

Thanks for your reply.
I have try to delete relation.idx. Then renumber another osm file at the same directory. This error doesn't occur any more.