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Bosede Omolayo 16Bosede Omolayo 16 

Trailhead: Build a Rich Publisher App - Failed to save CapricornPublisher.cmp: Invalid definition for null:caseController: null: Source - was anyone able to resolve this error?

SandhyaSandhya (Salesforce Developers) 

I would suggest you copy paste the code and check again if you have copied properly otherwise you can try in another playground which worked for me.

Best Regards,
Bosede Omolayo 16Bosede Omolayo 16
Thanks Sandhya. Using a new playground did not solve the problem. Does anyone have other suggestions? Thank you.