Providing the following information will be helpful in diagnosing the source of your issues.
### Steps to reproduce the problem
### Describe the problem in detail
### Describe the behavior you expected
<!-- Depending on the problem, the following may also be helpful -->
1. The output of `sessionInfo()`
2. The R code in question
3. A diagnostics report; see https://support.rstudio.com/hc/en-us/articles/200321257-Running-a-Diagnostics-Report
### System details
RStudio Edition: (Desktop or Server)
RStudio Version:
OS Version:
R Version:
In terms of helping you with the information you provided, the error message unable to restore saved data in C:/Users/Isrum/Documents/research/data/demog.RData suggest R is having trouble with that file. If you open a RStudio from a different projuct, can you open demog.RData successfully?