How to fix Error: ‘\u’ used without hex digits in character string starting “”c:\u” Error ?

How to fix Error: '\u' used without hex digits in character string starting

R-Studio is an open-source, software development platform that gives an easy-to-use and understands the environment to the client to interface with the R language all the more quickly and effectively. However, there is one common error message many users have encountered while loading a file from a drive into their code. That error is: ‘\u’ used without hex digits in character string starting “”c:\u” 

Getting error warnings is an inescapable component of programming. You often make typographical blunders without noticing. Since they are unavoidable, you need to figure out how to deal with them just as what makes them occur. R language has gained notoriety for producing these types of abstruse and vague errors. I personally encountered this one in my starting days but then after researching this error extensively I found a solution for it. In this article, I am going to share it with you guys. 

Reasons behind this error

This error happens when you endeavor to add a record file with a path having a symbol (\). This r hexadecimal blunder can happen when utilizing the read.csv () operation if the document location name or character path arrangement isn’t organized as expected and there is an error in reading characters of a string. Lamentably, the depiction in the error statement itself does not give any helpful data to the normal developer. It seems to be befuddling to some people because they would not anticipate seeing hex digits in the location of their desired file document. An illustration of this issue can be found in the below-mentioned code.  

x=read.csv (“C:\Users\Bob\Desktop\problem.csv”) 

At the outset, it does not look like there is anything mistaken here, overall, the record address is appropriately arranged. The complication is that this character of string set in syntax is erroneous and causing error. 

This one is actually a very ordinary blunder, often experienced by various users during programming. This issue is truly simple to tackle can be addressed effectively on the grounds that there is just one common cause for this one. This issue is brought about by some unacceptable sentence structure while composing the way to stack the CSV record from the disk into your code. 

This is because of the simple backlash ‘\’ that fills in as a marker of string literals. String literals are a stamp or string in quotations with an exceptional significance. These implications incorporate the designing of the content, octal digit, ASCII character, Unicode notations, and hexadecimal digits. So when you utilize the ‘/’ followed by a letter, it is searching for that exceptional importance. Since the letter, ‘u’ does not have an exceptional significance; it looks to ‘x’ that shows a hexadecimal number. Along these lines, it causes the program to create this error. This is certainly not a major issue and can be settled effectively in a brief period by going through the fixes provided in this article.

3 Ways to fix this: ‘\u’ used without hex digits in character string starting “”c:\u”?

Fixing this issue is entirely simple. We have provided you with three simple easy fixes. Every one of the three of these strategies utilizes an alternate method of staying away from this backlash issue.

  1. Using two backslashes
  2. Using a forward slash
  3. Editing the syntax

Video source: 

FIX 1: Using double backslashes

The easiest way by which this error can be resolved is just by adding a double backslash symbol. This is because double backslash (\\) has the uncommon meaning of a simple one. Assume there is a CSV. the file named problem.csv and it is present on your desktop and you need to stack it in Rstudio from the disk. On the off chance that you see this error statement, attempt to put a second backlash line in the way you are providing for load your CSV document. It intends to put a ‘\\’ rather than ‘\’ in your code.

!fix 1: ‘\u’ used without hex digits in character string starting “”c:\u”

x = read.csv (“C:\\Users\\Bob\\Desktop\\problem.csv”) 

This is the easiest solution. It works for me perfectly.

FIX 2: Using a forward slash

The subsequent way is to utilize a forward slash symbol. This methodology gets around the issue by killing the backslash out. On the off chance that still the ” error: ‘\u’ used without hex digits in character string starting “”c:\u” mistake message springs up on your screen while stacking a similar record from the downloads organizer, eliminate all the oblique punctuation lines from the way you are providing for load your CSV document, and write a forward slash instead of them. 

!fix 2: ‘\u’ used without hex digits in character string starting “”c:\u” 

x = read.csv (“C:/Users/Bob/Desktop/problem.csv”)

FIX 3: Editing the syntax

In the event that you actually cannot dispose of this issue, follow the linguistic structure beneath in your code to compose the way you are providing for loading your file. The third solution is to compare the string function to the record variable in the location read.csv (). This methodology keeps the first configuration while wiping out extraordinary implications from a hex digits r or another sort of strengthening character class.

!fix 3: ‘\u’ used without hex digits in character string starting “”c:\u”

x = read.csv (file = “C:\Users\Bob\Desktop\problem.csv”)


This is a simple mistake to make on the grounds that the standard record way address framework or character arrangement doesn’t function true to form. Notwithstanding, it is a simple one to address and stay away from once you become mindful of it. You can utilize any of these above-mentioned fixes to keep away from this R code mistake message, so go ahead and attempt them all.


How do you discover errors in R code? The most valuable and effective tool to figure out where an error happened is traceback () in your RStudio, which shows it naturally where a mistake happens.

  • What is a syntax error in R?

If you compose code that R can’t comprehend, you have punctuation blunders known as syntax errors. These mistakes consistently bring about an error message and are frequently brought about by incorrect spelling a capacity or failing to remember a section. 

  • How to easily debug in R language?

By troubleshooting the function debug () in R. It allows the user to step through the execution of a function, line by line.


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