I am trying to deploy package to Sandbox and getting the following error 
 

"message": "No matching source was found within the package root directory:

I run command in vscode 
 

sfdx force:package:version:create --targetdevhubusername DevHub --package 0Ho1W000000XXXXXXXX --versionnumber 1.0.0.NEXT --installationkeybypass --wait 10 --json

{
  "status": 1,
  "name": "Error",
  "message": "No matching source was found within the package root directory: /Users/01_Salesforce/CICD/app/force-app",
  "exitCode": 1,
  "commandName": "PackageVersionCreateCommand",
  "stack": "Error: No matching source was found within the package root directory: /Users/01_Salesforce/CICD/app/force-app\n
.....

I used the same template before another unlocked package. It is working with no issue. 
I cannot figure out why this happened in the first place and how to resolve it.

P.S. it is a new package I try to deploy. I created based on my previous template. 
It ways on the state of package creation. 
 

I'm getting this error after allowing 'SalesforceDX Namespace Registry' after clicking on 'Link Namespace' and entering the credentials.