Assert Failed Packed when trying to copy metadata in lua script

[KerdosMedia]

I'm trying to write a lightroom classic plugin. One of the steps is to copy metadata from one photo to another.

I'm using :

newPhoto:setRawMetadata("keywords", oldPhoto:getRawMetadata("keywords"))

but it throws the error.

Also "title" is an unrecognized metadata key even though it apears in the sdk docs.

[johnrellis]

"but it throws the error."

What's the error?

[KerdosMedia]

It's in the title a assert failed packed

[johnrellis]

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According to the API docs, photo:setRawMetadata() doesn't support the key "keywords":

Instead, use photo:addKeyword() and removeKeyword().

[johnrellis]

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""title" is an unrecognized metadata key even though it apears in the sdk docs."

Use photo:getFormattedMetadata() rather than getRawMetadata():

[KerdosMedia]

There is no setFormattedMetadata, how do I set title? I couldn't just move the photos so I'm copying, reimporting and copying metadata. Title is one of the important fields for me.

[johnrellis]

Some fields you retrieve with getFormattedMetadata(), some with getRawMetadata(). But you set all fields using setRawMetadata().

[KerdosMedia]

Thank you for your help. I was able to finish my plugin. What is the software you're using in the screenshots you posted? It looks like it would be helpful.