got this when following trailhead use standard controller instructions (working through section: find a record ID

any help fixing this?

Invalid 'X-Frame-Options' header encountered when loading 'https://na35.salesforce.com/apexpages/devmode/devConsoleViewStateMetadataReceiver.apexp?sfdcIFrameOrigin=https%3A%2F%2Fc.na35.visual.force.com': 'ALLOW-FROM https://c.na35.visual.force.com' is not a recognized directive. The header will be ignored.

Trying to complete step 3 of Mars Communication Uplink and keep getting the following: 

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: [Next__c]: [Next__c]

I do see the field Next__c listed for object fields and it is required...not sure what is wrong.  Can anyone help?

got this when following trailhead use standard controller instructions (working through section: find a record ID

any help fixing this?

Invalid 'X-Frame-Options' header encountered when loading 'https://na35.salesforce.com/apexpages/devmode/devConsoleViewStateMetadataReceiver.apexp?sfdcIFrameOrigin=https%3A%2F%2Fc.na35.visual.force.com': 'ALLOW-FROM https://c.na35.visual.force.com' is not a recognized directive. The header will be ignored.