Don't merge sample by chain_samples.py

[2209983424]

Hi!
when i merged my all sample,the error that " Expects to see tmp_roots_3-2.0.gff,tmp_roots_3-2.0.mega_info.txt,tmp_roots_3-2.0.group.txt but one or more files are missing! Abort! " was appeared.But tmp_roots_3-2.1 tmp_roots_3-2.4 tmp_roots_3-2.6 were got.This error result in failing that merge all sample by chain_samples.py.Can you help me solve the problem?thanks