Marketing Cloud AMPscript Error Fixes

The subscriber preview failed to generate. Review the details, correct all issues, and try again.
– The specified attribute or custom object field name was not found for this client. Function Call: Lookup(‘MyNTORewards’,MyNTOLevel,’SubscriberKey’,@subscriberkey)
Attribute or Field Name: MyNTOLevel

When performing a lookup function in AMPscript, make sure the column names are wrapped in quotes.
Solution: change MyNTOLevel to ‘MyNTOLevel’.
Reference: Lookup

More to come; this post will be updated on an ongoing basis.