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Tarun Kumar MohantyTarun Kumar Mohanty 

Error: You can't change a Lightning page's associated template.

Hi everyone  I am trying to deploy code on sandbox using ant but got some  error
 Error: You can't change a Lightning page's associated template.

please help me found out actual meaning

Thank you.
SwethaSwetha (Salesforce Developers) 
HI Tarun,
As the error suggests, you will not be able to change a Lightning page's associated template. You will need to recreate your pages in the target org 

https://salesforce.stackexchange.com/questions/239243/error-when-trying-to-deploy-lightning-page-error-you-cant-change-a-lightning

As per the document :
https://developer.salesforce.com/docs/atlas.en-us.api_meta.meta/api_meta/meta_flexipage.htm

template FlexiPageTemplateInstance Required. The template associated with the Lightning page.

This field is available in API version 39.0 and later.

as per the docs, the template attribute is of type FlexiPageTemplateInstance

Meaning it's an instance of the template. which means that somewhere underlying this instance needs to be defined.

Related Idea: https://ideas.salesforce.com/s/idea/a0B8W00000GdVwEUAV/allow-lightning-apprecord-page-template-change-on-edit-instead-of-recreating

If this information helps, please mark the answer as best. Thank you