error on the newest version of ubuntu core

(classic)ubuntu@localhost:~/software$ snapcraft snap

pyversions -d

/tmp/tmprrqaops6: 2: exec: pyversions: not found

Command '['/bin/sh', '/tmp/tmprrqaops6', 'pyversions', '-d']' returned non-zero exit status 127

(classic)ubuntu@localhost:~/software$

 

 

 

name: app

version: 0.1

summary: app

description: app

 

parts:

   flask:

      plugin: python2

      source: .