trying to use CRAN without setting a mirror

[JSorkin]

I am getting the following error message:
Error in contrib.url(repos, "source") : trying to use CRAN without setting a mirror Calls: . . . withVisible -> eval -> eval -> install.packages

I don't know what is causing the error, nor do I know how to resolve the error. The error only occurs when I try to knit my code; when I run chunk by chunk, I don't get the error.

I thank you for any help you might be able to offer.
John

[andresrcs]

To help us help you, could you provide a reproducible example (reprex) illustrating your issue? Please have a look at this guide, to see how to create one:

FAQ: How to do a minimal reproducible example ( reprex ) for beginners

A minimal reproducible example consists of the following items: A minimal dataset, necessary to reproduce the issue The minimal runnable code necessary to reproduce the issue, which can be run on the given dataset, and including the necessary information on the used packages. Let's quickly go over each one of these with examples: Minimal Dataset (Sample Data) You need to provide a data frame that is small enough to be (reasonably) pasted on a post, but big enough to reproduce your issue. Let's say, as an example, that you are working with the iris data frame head(iris) #> Sepal.Length Sepal.Width Petal.Length Petal.Width Species #> 1 5.1 3.5 1.4 0.…

[Shivani_Jaiswal]

Problem while knitting the markdown file into html. Please help.

Quitting from lines 15-35 (reg_model_project.Rmd)
Error in contrib.url(repos, "source") :
trying to use CRAN without setting a mirror
Calls: ... withVisible -> eval -> eval -> install.packages -> contrib.url

Execution halted