ValueError: Couldn't find 'checkpoint' file or checkpoints in given directory ./model

[xuxiuzhi2627]

my file model has the following contents:
checkpoint.checkpoint
model.ckpt-31880.data-00000-of-00002
model.ckpt-31880.index
model.ckpt-31880.meta
model.ckpt-31880.data-00001-of-00002
It has a problem when I run prediction.py,can you help me? My email is 2627084603@qq.com
ValueError: Couldn't find 'checkpoint' file or checkpoints in given directory ./model