blu ray player won't play bd-r dvd

[jawad]

UPDATE:
ALSO WANTED TO LET YOU GUYS KNOW, that this is for my client and I am using Toast Titanium 8 to burn it. I tried 10 but it crashes when I select by external dvd burner

Hi Everyone,
I have bdp s 550. Recently i purchased lacie blu ray burner and it burns the disc fine and plays it back in the drive but when i pop it in blu ray burner (it doesn't read the disc). Say cannot play disc.

I had a similar problem with a regular DVD-R once as well.

Btw I am using Sony BD-R.

Any ideas?