shiny - Suddenly I get "Error : $ operator is invalid for atomic vectors" -


i've been developing shiny app no issues. when try run following error: 

error : $ operator invalid atomic vectors warning: error in $: $ operator invalid atomic vectors stack trace (innermost first): 68: tag 67: tags$a 66: tag 65: tags$li 64: fun 63: lapply 62: buildtabset 61: tabsetpanel 60: tag 59: tags$div 58: div 57: tabpanel 56: tabsetpanel 55: tag 54: tags$div 53: div 52: fluidrow 51: tag 50: tags$div 49: div 48: hidden 47: tag 46: tags$div 45: div 44: taglist 43: attachdependencies 42: bootstrappage 41: fluidpage  1: runapp error : $ operator invalid atomic vectors

however, there's no indication of error occurring doesn't specify variable. know cause such error? app has 1000s of lines of code it's not practical share here.


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