Q: package 'vegan' was installed by an R version with different internals I have installed R-3.4.4 for Windows (32/64 bit) and RStudio 1.1.442 - Windows Vista/7/8/10. I installed package of vegan 2.4-6. When I try opening it then I get the message:
> install.packages("C:/Users/Na Talia/Rpackages/vegan_2.4-6.zip", repos = NULL, type = "win.binary")

Installing package into 'C:/Users/Na Talia/Documents/R/win-library/3.4'

(as 'lib' is unspecified)

package 'vegan' successfully unpacked and MD5 sums checked

> library("vegan", lib.loc="~/R/win-library/3.4")

Error: package 'vegan' was installed by an R version with different internals; it needs to be reinstalled for use with this R version

In addition: Warning message:
package 'vegan' was built under R version 3.5.0 

Any help? Thank you for your time in advance. 
P.S. I get the same message in R as well. I reinstalled vegan several times but nothing helps.

A: Since you are accessing the package from lib.loc="~/R/win-library/3.4", you should be installing the package in that directory.
You can use the command as 
install.packages("C:/Users/Na Talia/Rpackages/vegan_2.4-6.zip", repos = NULL, type = "win.binary", lib = "~/R/win-library/3.4")
Without specifying the lib path, R uses the first element of .libPaths().
