#JavaScript Developer0 discussing

Hi, 

I am currently going through the following tutorial.

https://trailhead.salesforce.com/de/content/learn/projects/develop-app-with-salesforce-cli-and-source-control/develop-new-feature-map-component?trailmix_creator_id=strailhead&trailmix_slug=prepare-for-your-salesforce-javascript-developer-i-credential

When I enter the following command

```

sfdx force:source:push

```

I get the following error:

```

sw@MacBook-Pro sfdx-chan % sfdx force:source:push                 

Job ID | 0Af1X000012P2wySAC

SOURCE PROGRESS | ██████████████████████████████████████░░ | 48/51 Components

TYPE   PROJECT PATH                                                               PROBLEM

─────  ─────────────────────────────────────────────────────────────────────────  ───────────────────────────────────────────────────────────────────────────────────────────────

Error  force-app/main/default/flexipages/Property_Record_Page.flexipage-meta.xml  Property 'componentInstances' not valid in version 49.0 (3:23)

Error  force-app/main/default/applications/DreamHouse.app-meta.xml                Property_Record_Page ist nicht vorhanden oder ist keine gültige Überschreibung für Aktion View.

Error  force-app/main/default/objects/Property__c/Property__c.object-meta.xml     Property_Record_Page ist nicht vorhanden oder ist keine gültige Überschreibung für Aktion View.

```

Any idea on how to solve this?

Hi, I'm new here and I've been taking the "Salesforce JavaScript Developer I Credential" course and I've gotten stuck and I'm not sure how to proceed. 

I have a full explanation here: https://trailblazers.salesforce.com/answers?id=9064S000000Cqzn but here is a quick recap. I'm using "sfdx" v29+ and when I ran the "sfdx force:project:create" method and then followed the instructions in this task: https://trailhead.salesforce.com/content/learn/projects/develop-app-with-salesforce-cli-and-source-control/create-salesforce-dx-project?trailmix_creator_id=strailhead&trailmix_slug=prepare-for-your-salesforce-javascript-developer-i-credential

After getting this setup I went on to "Develop the Map Component". This task has you run this command: "sfdx force:source:push". The first time I ran this there was an error that I tracked down to incorrect XML after v29 in Property_Record_Page.flexipage-meta.xml where I needed to change <componentInstances> to <itemInstances><componentInstance>. Now when I run the command I get 

TYPE

Error

PROJECT PATH

force-app/main/default/flexipages/Property_Record_Page.flexipage-meta.xml

PROBLEM

We couldn't retrieve the design time component information for component c:PropertyCarousel.

I can't figure out from searching online how to resolve this issue. If I remove the XML definition for PropertyCarousel then it just throws this same error for a different component.