warning: Embedding dir exists, did you set global_step for add_embedding()?

I was doing the pytorch tensor board tutorial. While running the pytorch_tensorboard_.py notebook file, I get this:

warning: Embedding dir exists, did you set global_step for add_embedding()?

Somebody else also faced this (might be in a different case). I don't understand the cause & effect of this, any help?

Thanks in advance!