Couldn't find an identify for pass

Hi, developers.

Steps

I tried to create pkpass file while following guidance from Apple.

(1) I created pass type ID and download certificate successfully.

(2) And then built Xcode and generated `signpass`

(3) Then, I moved the `signpass` executable to Document folder by following the guidance.

(4) Then, I created new folder named "Lollipop.pass" and add `pass.json` file to the folder

{
     "formatVersion" : 1,   
     "passTypeIdentifier" : "pass.com.mypasstypeid", 
     "teamIdentifier" : "team id here" 
     ...
}

Issue

However I found that it has been failed while run the following commands in terminal

./signpass -p Lollipop.pass 

The terminal said:

signpass[3178:216860] Couldn't find an identity for pass.com... 

I followed Apple's guide entirely. Please let me know what the problem is.

P.S. There is no problem on double quote in the `.json` file