Hello @poisnedbysmityj ,
Seems hextom_tms_rtl.liquid belongs to app and you removed the app but the leftover of the app still in theme files.
To fix it:
1) Check the files manually and search for 'hextom_tms_rtl.liquid' once found remove it. ( It's a clean solution )
2) Go to snippets and create a blank template with name hextom_tms_rtl ( It will also work but unnecessary code of the app will remain in theme files )