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Anuj MehraAnuj Mehra 

I'm getting error (Could not find a custom object 'Offer__c'). while creating Build a custom Offer object. Can anyone please help?

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NagendraNagendra (Salesforce Developers) 
Hi Anuj,

Sorry for this issue you are facing.

Remember, this module is meant for Lightning Experience. When you launch your hands-on org, switch to Lightning Experience to complete this challenge.

Please try the below steps:

1. Create a new Trailhead Playground.
2. Click the Object Manager tab.
4. Click Create | Custom Object in the top right corner.
5. For Label, enter 'Offer'.
6. For Plural Label, enter 'Offers'.
7.Object Name 'Offer'.
8.Record Name 'Offer Name'.
9.Data type 'Auto Number'.
10.Display format 'OF-{0000}'.
11.string number 123.
12. Check the box for Launch New Custom Tab Wizard after saving this custom object.
13. Leave the rest of the values as default and click Save.
14. Select your desired Tab Style and click Next, Next, and Save.
15. Then goto Fields & Relationships in 'Offer' object and click 'New' button in top right corner.
16. In data type select Currency and click next.
17. For Label, enter 'Offer Amount'.
18. Select your desired Tab Style and click Next, Next, and Save.
19. In data type select Date and click next.
20. For Label, enter 'Target Close Date'.
21. Select your desired Tab Style and click Next, Next, and Save.

Please let me know if you have any query.
Please mark it as best Answer if you find it helpful.

Anuj MehraAnuj Mehra
Hi Nagendra  

Thank you so much for taking time and responding to my query. 
You mentioned the module is meant for SalesForce Lightning but I'm facing issues with running it since I bump into a blank screen like below after every few steps. Hence, I have been working on the classic. 

Can you please help?

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Anuj Mehra