Getting "lazy load database corrupt" errors

Question

I have had some problems with R recently. I was trying to install nnet which seemed not to be working. I followed the advice on this question and used remove.packages () and unloadNamespace() on 'car', 'effects', and 'sjPlot'.

Problems trying to install package in R

This was successful in installing nnet, however now I'm unable to reinstall the three packages. After reinstalling each package, r states:

>library(sjPlot)
>Error in get(method, envir = home) : 
>  lazy-load database '\\xxx/SSD_Home_Data_O/xxx/My Documents/R/win-library/3.2/car/R/car.rdb' is corrupt
> 2: In .registerS3method(fin[i, 1], fin[i, 2], fin[i, 3], fin[i, 4],  :
  restarting interrupted promise evaluation
>3: In get(method, envir = home) :
  restarting interrupted promise evaluation
>4: In get(method, envir = home) : internal error -3 in R_decompress1
Error: package or namespace load failed for ‘sjPlot’

Any ideas how to fix this? I'm a bit worried as I really need to use sjPlot in particular