Hello,
Sounds like the Blacksmith Shader code you used was a console code that you entered in on your Ps3. Since you moved to Ps4, the license to that shader is, unfortunately, still on your Ps3 console and there is no way to transfer it to your Ps4.
https://www.bungie.net/en/Help/Article/12233
You'll have to find a new and unused code of you wish to use the Blacksmith Shader on your Ps4.
Some things don't cascade up the consoles. Like something redeemed on a legacy won't carry over to the current console.
I wouldn't be surprised if this was one, but I can't say for sure.