Project crashes if "Packrat" is activated (Fatal error 4)

I created a new RStudio project. It seemed to work fine until I activated the option to use the packrat package and a folder "packrat" was created in the project's directory as expected. Unfortunately, now RStudio crashes every time I try to open the project and the message of a fatal error appears:

Before my attempt to open the project, "package:utils" can be found on the search list by using search().

If I delete the "pacrat" folder, RStudio works as usual and I can open the project without any message of fatal error, but without packrat.

I'd like to know what are the causes and what must be done to avoid this fatal error without losing functionality of packrat?

I run RStudio under Windows 10:

# R version 3.2.3 (2015-12-10)
# Platform: x86_64-w64-mingw32/x64 (64-bit)
# Running under: Windows >= 8 x64 (build 9200)
# RStudio (0.99.491) 

Reproduce the crash by opening a new RStudio project with Packrat activated and its packrat folder present, using the reported R 3.2.3, RStudio 0.99.491, and Windows environment. Investigate the fatal error and confirm that opening the project with Packrat enabled no longer crashes while preserving Packrat functionality.