# Could not find function "read\_ipums\_ddi"

**URL:** <https://forum.ipums.org/t/could-not-find-function-read-ipums-ddi/3909>\
**Category:** General\
**Created:** [December 28, 2020, 4:31pm UTC](https://forum.ipums.org/t/could-not-find-function-read-ipums-ddi/3909 "2020-12-28T16:31:13Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Gonzalo\_Pita](https://avatars.discourse-cdn.com/v4/letter/g/2bfe46/32.png) [@Gonzalo\_Pita](https://forum.ipums.org/u/Gonzalo_Pita)\
**Post date:** [December 28, 2020, 4:31pm UTC](https://forum.ipums.org/t/could-not-find-function-read-ipums-ddi/3909/1 "2020-12-28T16:31:13Z")

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Hi,  
I installed all the updates that ipumsr requires, but then I got to the following error message:

library(ipumsr)  
Error: package or namespace load failed for ‘ipumsr’ in rbind(info, getNamespaceInfo(env, “S3methods”)):  
number of columns of matrices must match (see arg 2)  
In addition: Warning message:  
package ‘ipumsr’ was built under R version 3.5.3

And I keep receiving the same error message I have been receiving since I started:

> ddi ← read\_ipums\_ddi(“ipumsi\_00001.xml”)  
> Error in read\_ipums\_ddi(“ipumsi\_00001.xml”) :  
> could not find function “read\_ipums\_ddi”

Help is appreciated!

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**Author:** ![Grace\_Cooper](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.ipums.org/grace_cooper/32/376_2.png) [@Grace\_Cooper](https://forum.ipums.org/u/Grace_Cooper)\
**Post date:** [January 5, 2021, 7:55pm UTC](https://forum.ipums.org/t/could-not-find-function-read-ipums-ddi/3909/2 "2021-01-05T19:55:29Z")

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What version of R are you using? I could be wrong but this looks like an issue that can be solved by upgrading R (see this [stackoverflow post](https://stackoverflow.com/questions/35082143/error-package-or-namespace-load-failed-for-car) for a similar issue). According to the [documentation](https://cran.r-project.org/web/packages/ipumsr/ipumsr.pdf), ‘ipumsr’ depends on an R package of 3.5.0 or greater.

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**Author:** ![Gonzalo\_Pita](https://avatars.discourse-cdn.com/v4/letter/g/2bfe46/32.png) [@Gonzalo\_Pita](https://forum.ipums.org/u/Gonzalo_Pita)\
**Post date:** [January 5, 2021, 8:07pm UTC](https://forum.ipums.org/t/could-not-find-function-read-ipums-ddi/3909/3 "2021-01-05T20:07:08Z")

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I have a R version 4.0.3 (2020-10-10)

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**Author:** ![KariWilliams](https://avatars.discourse-cdn.com/v4/letter/k/82dd89/32.png) [@KariWilliams](https://forum.ipums.org/u/KariWilliams)\
**Post date:** [January 8, 2021, 2:22pm UTC](https://forum.ipums.org/t/could-not-find-function-read-ipums-ddi/3909/4 "2021-01-08T14:22:54Z")

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Thanks for the additional information. My first suggestion is to try reinstalling ipumsr with the following command:  
`install.packages("ipumsr")`

If you continue to run into issues, we may be able to help troubleshoot if you share the output from the `sessionInfo()` command with us at [ipums@umn.edu](mailto:ipums@umn.edu).