at=list error "undefined columns selected"

Hello community, I am a R beginner! Maybe there is an easy solution and you can help? Sorry for not providing a dataset, every single step in R is hard for me. Thanks for your help!

Please specify whether your issue is about:

[ ] a possible bug
[ ] a question about package functionality
[ ] a suggested code or documentation change, improvement to the code, or feature request

If you are reporting (1) a bug or (2) a question about code, please supply:

a fully reproducible example using a publicly available dataset (or provide your data)
if an error is occurring, include the output of traceback() run immediately after the error occurs
the output of sessionInfo()

Put your code here:


## load package
library("margins")

## code goes here

reg_detachment_wtcbreaks_model4 <- lm(formula = detachment ~ dummy1 + dummy2 + dummy3 + dummy4  + dummy5 + dummy6 + continuous + dummy7 + age + wtc_breaks + age*wtc_breaks, data=data_final) # all dummies are factors, the others are dbl+lbl

margins::margins(reg_detachment_wtcbreaks_model4, variables="wtc_breaks", at=list(age=c(23,24,25))) # works fine if I run it without the at-argument

## error message

> traceback()
8: stop("undefined columns selected")
7: `[.data.frame`(dat, , not_numeric, drop = FALSE)
6: dat[, not_numeric, drop = FALSE]
5: check_values(data, at)
4: check_at(data, at)
3: build_datalist(data, at = at)
2: margins.lm(reg_detachment_wtcbreaks_model4, variables = "wtc_breaks", 
       at = list(age = c(23, 24, 25)))
1: margins::margins(reg_detachment_wtcbreaks_model4, variables = "wtc_breaks", 
       at = list(age = c(23, 24, 25)))

## sessionInfo

R version 4.1.0 (2021-05-18)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19042)

Matrix products: default

locale:
[1] LC_COLLATE=German_Germany.1252  LC_CTYPE=German_Germany.1252    LC_MONETARY=German_Germany.1252
[4] LC_NUMERIC=C                    LC_TIME=German_Germany.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
 [1] margins_0.3.26  Hmisc_4.5-0     ggplot2_3.3.3   Formula_1.2-4   survival_3.2-11 lattice_0.20-44 sjPlot_2.8.8   
 [8] ggeffects_1.1.0 lavaan_0.6-8    horst_0.1       dplyr_1.0.6     haven_2.4.1     psych_2.1.6    

loaded via a namespace (and not attached):
  [1] nlme_3.1-152        fs_1.5.0            usethis_2.0.1       devtools_2.4.2      insight_0.14.2     
  [6] RColorBrewer_1.1-2  rprojroot_2.0.2     tools_4.1.0         backports_1.2.1     utf8_1.2.1         
 [11] R6_2.5.0            sjlabelled_1.1.8    rpart_4.1-15        DBI_1.1.1           colorspace_2.0-1   
 [16] nnet_7.3-16         withr_2.4.2         gridExtra_2.3       tidyselect_1.1.1    prettyunits_1.1.1  
 [21] mnormt_2.0.2        processx_3.5.2      emmeans_1.6.1       compiler_4.1.0      performance_0.7.2  
 [26] cli_2.5.0           htmlTable_2.2.1     desc_1.3.0          bayestestR_0.10.0   checkmate_2.0.0    
 [31] scales_1.1.1        mvtnorm_1.1-2       readr_1.4.0         callr_3.7.0         stringr_1.4.0      
 [36] digest_0.6.27       pbivnorm_0.6.0      foreign_0.8-81      minqa_1.2.4         htmltools_0.5.1.1  
 [41] jpeg_0.1-8.1        base64enc_0.1-3     pkgconfig_2.0.3     lme4_1.1-27         sessioninfo_1.1.1  
 [46] fastmap_1.1.0       htmlwidgets_1.5.3   rlang_0.4.11        rstudioapi_0.13     generics_0.1.0     
 [51] magrittr_2.0.1      parameters_0.14.0   Matrix_1.3-3        Rcpp_1.0.6          munsell_0.5.0      
 [56] fansi_0.4.2         prediction_0.3.14   lifecycle_1.0.0     stringi_1.6.1       MASS_7.3-54        
 [61] pkgbuild_1.2.0      grid_4.1.0          parallel_4.1.0      sjmisc_2.8.7        forcats_0.5.1      
 [66] crayon_1.4.1        splines_4.1.0       sjstats_0.18.1      hms_1.1.0           tmvnsim_1.0-2      
 [71] knitr_1.33          ps_1.6.0            pillar_1.6.1        boot_1.3-28         estimability_1.3   
 [76] effectsize_0.4.5    stats4_4.1.0        pkgload_1.2.1       glue_1.4.2          latticeExtra_0.6-29
 [81] data.table_1.14.0   remotes_2.4.0       modelr_0.1.8        vctrs_0.3.8         png_0.1-7          
 [86] nloptr_1.2.2.2      testthat_3.0.3      gtable_0.3.0        purrr_0.3.4         tidyr_1.1.3        
 [91] assertthat_0.2.1    cachem_1.0.5        xfun_0.23           xtable_1.8-4        broom_0.7.6        
 [96] tibble_3.1.1        tinytex_0.31        memoise_2.0.0       cluster_2.1.2       ellipsis_0.3.2     
>

leeper / margins

at=list error "undefined columns selected" #173