Line 159 col 17 Expected an identifier and instead saw ‘MMM-Tado’.

so, lets look on the line BEFORE 159, cause there was a problem (it is NOT expecting to see )

}    // < --- 
what is this? 
     {     // < mmm-tado module start

         module: 'MMM-Tado',
         position: 'middle',
         config: {
             username: '********',
             password: '*******',
             updateInterval: 300000
         }
     }  // < mm-tado end

end of all modules is ], but I don’t see that either

Line 155 col 2 ‘destructuring binding’ is available in ES6 (use ‘esversion: 6’) or Mozilla JS extensions (use moz).
Line 159 col 17 Expected an identifier and instead saw ‘MMM-Tado’.
Line 160 col 19 Expected an identifier and instead saw ‘top_right’.
Line 162 col 23 Expected an identifier and instead saw ‘*****’.
Line 163 col 23 Expected an identifier and instead saw ‘*******’.
Line 164 col 29 Expected an identifier and instead saw ‘300000’.
Line 174 col 1 Unexpected ‘if’.
Line 174 col 1 Expected an identifier and instead saw ‘if’ (a reserved word).
Line 174 col 3 Missing semicolon.
Line 174 col 34 Expected an assignment or function call and instead saw an expression.
Line 174 col 35 Missing semicolon.

add a } in the same column on a new line, put stuff between them

each module should end with },

after the last module is the ] of the modules:[ list started at the top

each module has AT LEAST

{
    module:"???name???",
    config: {
    }
},

all config stuff for the module goes between the {} and close of the config: section

Try putting a comma after the curly bracket at the end of the news entry, like so:

paths: {
    modules: 'modules',
    vendor: 'vendor'
  }
}, 

then your tado entry after that

This is how my config looks now.

Thanks

 title: 'BBC',
            url: 'http://feeds.bbci.co.uk/news/rss.xml'
          }
        ],
        startTags: [],
        endTags: [],
        prohibitedWords: []
      }
    }
  ],
  paths: {
    modules: 'modules',
    vendor: 'vendor'
  }
}


{
        module: 'MMM-Tado',
        position: 'top_right', // This can be any of the regions.
        config: {
            username: '***', 
            password: '***', 
            updateInterval: 300000
        }
    },
     

So, assuming your MM was working before you tried to add this, I would remove that addition. Check that your MM is now running again, then add

{
        module: 'MMM-Tado',
        position: 'top_right', // This can be any of the regions.
        config: {
            username: 'your_tado_username', 
            password: 'your_tado_password', 
            updateInterval: 300000
        }
    },

Following this guide

https://forum.magicmirror.builders/topic/4231/how-to-add-modules-for-absolute-beginners