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Thirumoorthi Murugan 3Thirumoorthi Murugan 3 

not able to add customer experience page with new template. getting An unexpected error occurred. Try again or contact your Salesforce administrator for help.

not able to add customer experience page with new template. getting An unexpected error occurred. Try again or contact your Salesforce administrator for help.

Want to add new experience template and design the customer community in dev org.
 
PriyaPriya (Salesforce Developers) 
Hey,

Refer this to implement :- 
https://trailhead.salesforce.com/en/content/learn/projects/communities_theme_layout/create_community_theme

If it works, kindly mark it as best answer.

Thanks!