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Athira VenugopalAthira Venugopal 

lwc1057 label is not valid attribute for lightningtab

<template>
<lightning-tabset>
<lightning-tab label="Item One">
One Content !
</lightning-tab>
<lightning-tab label="Item Two" title="2nd tab extended title">
Two Content !
</lightning-tab>
<lightning-tab label="Item Three">
Three Content !
</lightning-tab>
</lightning-tabset>
</template>

I am deploying using VSCODE
AnudeepAnudeep (Salesforce Developers) 
I see no issue with the code. Try deploying LWC component using sfdx deploy:lwc command on VS Code terminal.

sfdx deploy:lwc -p lwc-component-folder-path sfdx deploy:lwc -p "c:/Works/Projects/DevCode/src/main/default/lwc/tabTest/"

See this post

Let me know if this helps