Unable to determine package source for Bioconductor package graph

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I am trying to deploy a shinyapp but getting the following error:

> deployApp()
Preparing to deploy application...
Update application currently deployed at
https://komalrathi.shinyapps.io/medulloclassifiershinyapp/? [Y/n] Y
DONE
Uploading bundle for application: 1380990...DONE
Deploying bundle: 2535955 for application: 1380990 ...
Waiting for task: 661489247
  building: Parsing manifest
################################ Begin Task Log ################################ 
################################# End Task Log ################################# 
Error: Unhandled Exception: Child Task 661489248 failed: Error parsing manifest: Unable to determine package source for Bioconductor package graph: Repository must be specified
In addition: Warning messages:
1: invalid uid value replaced by that for user 'nobody' 
2: invalid gid value replaced by that for user 'nobody'

This is my sessionInfo:

> sessionInfo()
R version 3.6.1 (2019-07-05)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS High Sierra 10.13.6

Matrix products: default
BLAS:   /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.6/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

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

other attached packages:
[1] rsconnect_0.8.15

loaded via a namespace (and not attached):
[1] BiocManager_1.30.9 compiler_3.6.1     tools_3.6.1        curl_4.1           yaml_2.2.0        
[6] jsonlite_1.6       packrat_0.5.0      openssl_1.4.1      askpass_1.1

Here is the minimal app.R code to reproduce the error:

library(shiny)
library(shinydashboard)
library(medulloPackage)

ui <- dashboardPage(
  dashboardHeader(title = "Classifier"),
  dashboardSidebar(
  ),
  dashboardBody(
  )
)

server <- function(input, output) {
}

shinyApp(ui, server)

Before running, you will have to first install medulloPackage using the following:

devtools::install_github("d3b-center/medullo-classifier-package")

The error is coming when I use this package so not sure how to handle it.