I have been unable to mark the Trailhead module "Creating and Customizing Lightning Apps" as read. There is no assigned challenge, and it says to complete the module, it must be marked as read. I am signed in, and still unable to mark ad read. Any suggestions?

Thanks,
Eli

I have been unable to mark the Trailhead module "Creating and Customizing Lightning Apps" as read. There is no assigned challenge, and it says to complete the module, it must be marked as read. I am signed in, and still unable to mark ad read. Any suggestions?

Thanks,
Eli

I have been unable to mark the Trailhead module "Creating and Customizing Lightning Apps" as read. There is no assigned challenge, and it says to complete the module, it must be marked as read. I am signed in, and still unable to mark ad read. Any suggestions?

Thanks,
Eli

Exercise:
"Your company sells cylindrical hyperbaric chambers. You need a formula field that calculates the volume of a cylinder for you, rounded to the nearest whole number, given its radius and height. Use the existing mathematical formula for the volume of a cylinder, V = πr2h, where r is the radius of the cylinder, h is the height, and π is the constant Pi. Note: Although this formula field might best be created on a custom object, for simplicity, we’ll create this formula on the Opportunity object.
Create 2 custom fields of type Number on the Opportunity object: ‘radius’ with a resulting API name of ‘radius__c’ and ‘height’ with a resulting API name of ‘height__c’.
The formula should be named ‘Cylinder Volume’, with the resulting API name ‘Cylinder_Volume__c‘ and should be created on the Opportunity object.
The formula should reference the custom fields ‘radius__c‘ and ‘height__c‘.
The formula should use 3.14159 as an approximation of Pi."

The error: "Challenge Not yet complete... here's what's wrong: 
There was an unexpected error in your org which is preventing this assessment check from completing: System.DmlException: Insert failed. First exception on row 0; first error: REQUIRED_FIELD_MISSING, Required fields are missing: [Discount_Percent__c]: [Discount_Percent__c]"

I created 2 custom fields named radius and height, plus a custome field named Cylinder Volume into Opportunities Object. The formula I inseted into Cylinder Volume field is "ROUND(3.14159* radius__c * EXP(2) * height__c,0)". 
If I test it, inserting in the opportunity form the radius and height values, It works correctly but when I try to pass the challenge I receive the message above. I don't know why it refer to Discount_Percent__C fields.

Please Help me!!!