Uploading bundle error

I could not publish any shiny app. Error is as below.
Please assist.

Preparing to deploy application...DONE
Uploading bundle for application: 6770134...Error in if (name %in% available[, "Package"]) { :
argument is of length zero
Calls: ... tryCatch -> tryCatchList -> tryCatchOne ->
In addition: Warning messages:
1: In read.dcf(...) : error reading the file
2: In read.dcf(...) : error reading the file
3: In read.dcf(...) : error reading the file
4: In read.dcf(...) : error reading the file
Execution halted