Error in kniting Rmarkdown.

To help us help you, could you please prepare a reproducible example (reprex) illustrating your issue? Please have a look at this guide, to see how to create one: FAQ: How to do a minimal reproducible example ( reprex ) for beginners

Error in namespaceExport(ns, exports): undefined exports, There might be a number of ways to generate this error (hence a minimal reprex would be helpful), but I think fundamentally this message occurs when you try to export an object that doesn't exist. That is, the package NAMESPACE file contains the line "Sweave2knitr, all_labels," etc, but those objects don't exist. (stack overflow discussion there).
How you resolve the issue depends on how the error popped up. That stack overflow discussion walks through a few ways for it to have occurred.

Warnings 1 and 2 may be caused by the same issue or unrelated. Again, a minimal reprex would be helpful.

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