enter image description hereeverytime i open my saved project the Principled BSDF shader disappear from the list in node editor.

But in new tab it appear in node editor. i don`t know what to do (is that a bug)

  • $\begingroup$ Please, add screenshots $\endgroup$ – Crantisz Mar 7 '18 at 10:24

It's 2.78 version, you launch old version, that doesnt support principal BSDF shader:

enter image description here

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  • $\begingroup$ thaks bro i found the solution. its happning because i forget to reset the *.blend files default 2.79 $\endgroup$ – Naman Sood Mar 7 '18 at 13:29

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