Slingshot package ------ Error in crossprod(out) : "crossprod" is not BUILTIN function

[yolo177]

When I run this code: slingshot(rd2, reducedDim = rd2, clusterLabels = ChuCellTypes$Time, start.clus = '00h', end.clus = '96h') I encountered an error : Error in crossprod(out) : “crossprod” is not BUILTIN function

Initially, I thought it was a data or package version issue, but even after updating all packages, the error persists. Then, I tried to run the example code provided in the documentation for the slingshot function:

data("slingshotExample") rd <- slingshotExample$rd cl <- slingshotExample$cl pto <- slingshot(rd, cl, start.clus = '1') Still, it resulted in the same error: “Error in crossprod(out) : “crossprod” is not BUILTIN function”

Could someone please help me? Thank you very much!