Error: package or namespace load failed for ‘tidyverse’ in loadNamespace

I'm getting the following error when I'm loading tidyverse. It was all working fine a few minutes ago when I was running my shinyapp. How should I resolve this?

Error: package or namespace load failed for ‘tidyverse’ in loadNamespace(i, c(lib.loc, .libPaths()), versionCheck = vI[[i]]): namespace ‘rlang’ 0.3.0.1 is already loaded, but >= 0.3.1 is required