Error: package or namespace load failed for ‘prophet’ in dyn.load(file, DLLpath = DLLpath, ...)

Great package. I have integrated into modeltime (R package that uses prophet with tidymodels ecosystem). It’s working great.

I did run into one issue when using on MacOS (Windows I have not experienced this problem). I’ve referenced the issue business-science/modeltime#20.

Problem

MacOS seems to have an issue (sometimes???) when loading prophet.

> library(prophet)
Loading required package: Rcpp
Loading required package: rlang
Error: package or namespace load failed for ‘prophet’ in dyn.load(file, DLLpath = DLLpath, ...):
 unable to load shared object '/Library/Frameworks/R.framework/Versions/4.0/Resources/library/prophet/libs/prophet.so':
  dlopen(/Library/Frameworks/R.framework/Versions/4.0/Resources/library/prophet/libs/prophet.so, 6): Library not loaded: @rpath/libtbb.dylib
  Referenced from: /Library/Frameworks/R.framework/Versions/4.0/Resources/library/prophet/libs/prophet.so
  Reason: image not found

Solution

The easiest way to fix is to load StanHeaders. This sets the C++ flags and libraries, which seems to solve the missed libtbb.dylib path.

How I solved it with modeltime:

Add StanHeaders to Imports

Somewhere in the package import StanHeaders.

The same solution will work for prophet.

[mdancho84]

Hey @seanjtaylor & @bletham - I checked and this fixes the issues. Thanks for merging. I just had another student with the same issue.

[mdancho84]

Hey Ben,

Yes - I can do this. I know it will work because I’ve been doing it manually:

library(StanHeaders)
library(prophet)

Works fine on my machine. And all StanHeaders does is generate the C++ bindings for Rcpp & Stan (so it’s super lightweight).

I have a stacked schedule but hopefully by weekend I can send a PR addressing this.