rsconnect::deployApp() fails with "Error: $ operator is invalid for atomic vectors"

Suddently I cannot deploy my shiny application to, and I cannot figure out why.
It was working perfectlyl a couple of days ago. Please help!
Here is the full deployment log (using loglevel="verbose"):

> rsconnect::deployApp(logLevel="verbose")
----- Deployment log started at  2018-11-14 21:01:19  -----
Deploy command: 
 rsconnect::deployApp(logLevel = "verbose") 

Session information: 
R version 3.5.1 (2018-07-02)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Debian GNU/Linux buster/sid

Matrix products: default
BLAS: /usr/lib/x86_64-linux-gnu/blas/
LAPACK: /usr/lib/x86_64-linux-gnu/lapack/

 [1] LC_CTYPE=el_GR.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=el_GR.UTF-8        LC_COLLATE=el_GR.UTF-8    
 [7] LC_PAPER=el_GR.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            

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

loaded via a namespace (and not attached):
[1] compiler_3.5.1   rsconnect_0.8.11 tools_3.5.1      RCurl_1.95-4.11 
[5] bitops_1.0-6     openssl_1.0.2   
[1] path    name    value   secure  expires
<0 rows> (or 0-length row.names)
GET /v1/applications/551499 16263ms
Error: $ operator is invalid for atomic vectors
----- Deployment error -----
Error: $ operator is invalid for atomic vectors
----- Error stack trace -----
5: paste("Update application currently deployed at\n", app$url, 
       "? [Y/n] ", sep = "")
4: applicationForTarget(client, accountDetails, target, forceUpdate)
3: force(code)
2: withStatus(paste0("Preparing to deploy ", assetTypeName), {
       application <- applicationForTarget(client, accountDetails, 
           target, forceUpdate)
1: rsconnect::deployApp(logLevel = "verbose")

Thanks so much in advance!


I'm not a shiny guy, but the error message

is telling you that it was reading an argument expecting to find something like a data frame, where you can say df$variable and instead found only a list variable (i.e., an atomic vector). If you can inspect or class() /v1/applications/551499 you should be able to tell easily if that's the source of the error message.

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