In my flow I have 8 screens. in the screen of "DISEASES_SCREEN" its having a checkbox group called "diseases" that the user is selecting from. And in the next screen of "DISEASES_DATES" I have 3 dropdown list (User should go only to this screen if user made a certain choice in the DISEASES_SCREEN)

each dropdown's label in the "DISEASES_DATES" shows one of the user selections in the "DISEASES_SCREEN" screen as per my code.

This code was working successfully and I was able to send it to my personal WhatsApp to test it. but then I did a very tinny change then hit save it shows me the error in the attached screen.

I tried to undo my change but it still showing this weird error although it works as expected in the preview screen as you can see in the attached screen.

I spent hours and hours and hours to try to fix it and still no way!

The first screen

{
            "id": "DISEASES_SCREEN",
            "title": "${screen.PROFILE_SCREEN.data.screen_2_title}",

            "layout": {
                "type": "SingleColumnLayout",
                "children": [

{
                        "type": "Form",
                        "name": "form",
                        "children": [

                            {
                                "type": "TextSubheading",
                                "text": "${screen.PROFILE_SCREEN.data.diseases_label}"
                            },

{
    "type":"RadioButtonsGroup",
    "name": "have_diseases",
    "label": "${screen.PROFILE_SCREEN.data.have_diseases}",
     "required":true,
    "data-source":[
        {"id":"Yes","title": "${screen.PROFILE_SCREEN.data.yes}"},
        {"id":"No","title": "${screen.PROFILE_SCREEN.data.no}"}
    ]
},


{
"type":"If",
"condition": "(${form.have_diseases}=='Yes')",
"then": [
{
                                "type": "CheckboxGroup",
                                "label": "${screen.PROFILE_SCREEN.data.select_disease}",
                                "required": true,
                                "name": "diseases",
                                "data-source": "${screen.PROFILE_SCREEN.data.diseases_list}"

                            }
]
}
          ,

{
  "type": "If",
  "condition": "(${form.have_diseases}=='Yes')",
  "then": [

                            {
                                "type": "Footer",
                                "label": "${screen.PROFILE_SCREEN.data.continue}",
                                "on-click-action": {
                                    "name": "navigate",
                                    "next": {
                                        "type": "screen",
                                        "name": "DISEASES_DATES"
                                    },
                                    "payload": {
                                    }
                                }
                            }
  ],
  "else": [

                            {
                                "type": "Footer",
                                "label": "${screen.PROFILE_SCREEN.data.continue}",
                                "on-click-action": {
                                    "name": "navigate",
                                    "next": {
                                        "type": "screen",
                                        "name": "FAMILY_DISEASES_SCREEN"
                                    },
                                    "payload": {
                                    }
                                }
                            }
  ]
}

                        ]}]
                    }

            }

The second screen:

{
"id": "DISEASES_DATES",
"title": "${screen.PROFILE_SCREEN.data.screen_since_when_title}",
"layout": {
"type":"SingleColumnLayout",
"children": [

{
                                "type": "TextSubheading",
                                "text": "${screen.PROFILE_SCREEN.data.since_when}"
                            },

{
                    "type": "Dropdown",
                    "label": "${screen.DISEASES_SCREEN.form.diseases}[0]",
                    "name": "firstDiseaseSince",
                    "required": true,            
                    "data-source": "${screen.PROFILE_SCREEN.data.since_list}"
                          }
,
{
                    "type": "Dropdown",
                   "label": "${screen.DISEASES_SCREEN.form.diseases}[1]",
                    "name": "secondDiseaseSince",
                    "required": false,            
                    "data-source": "${screen.PROFILE_SCREEN.data.since_list}"
                          }
,

{
                    "type": "Dropdown",
                   "label": "${screen.DISEASES_SCREEN.form.diseases}[2]",
                    "name": "thirdDiseaseSince",
                    "required": false,            
                    "data-source": "${screen.PROFILE_SCREEN.data.since_list}"
                          },


{
                                "type": "Footer",
                                "label": "${screen.PROFILE_SCREEN.data.continue}",
                                "on-click-action": {
                                    "name": "navigate",
                                    "next": {
                                        "type": "screen",
                                        "name": "FAMILY_DISEASES_SCREEN"
                                    },
                                    "payload": {
                                    }
                                }
                            }


]



}


}