A region must be a GeoJSON Polygon or LinearRing. Got: 'MultiPoint'

I am new to Google Earth Engine and was trying to run a script to get Landsat images of districts of India after having a fusion table of shapes of all districts.
GEE script is as:

var india = ee.FeatureCollection('ft:1UDdgOCf8DoRJ9bVm-UVbR6CqxtkJToLQjTFd0r0Z','geometry')
    .filter(ee.Filter.eq('Name', 'India'))
    .geometry();
var district = ee.FeatureCollection('ft:1_GTWq6xk3hMYl6LelMm8o3VlnoHH0bsFUzLiW3_i','geometry')
    .filter(ee.Filter.eq('district', district_name));

where district_name is a defined variable containing the name of a district

 var india_image = ee.ImageCollection('LANDSAT/LC08/C01/T1_TOA')
    .filterBounds(india)
    .filterDate('2014-03-01', '2014-09-01')
    .sort('CLOUD_COVER')
    // .limit(500)
    .map(maskClouds)
    .median();
var district_image = ee.ImageCollection('LANDSAT/LC08/C01/T1_TOA')
    .filterBounds(district)
    .filterDate(year + '-03-01', year + '-05-01')
    .sort('CLOUD_COVER')
    .map(maskClouds)
    .median();

and then after performing few actions having no affect on any of the variables, I am exporting these images to my Google drive.

Export.image.toDrive({
  image: input.clip(district),
  description: district_name + '_summer_' + year,
  folder : 'Project_data',
  maxPixels: 499295920080,
  scale: 30,
  region: district
});

But here after executing and pressing “RUN” button in “Tasks” pane of GEE, I am getting the error “A region must be a GeoJSON Polygon or LinearRing. Got: ‘MultiPoint'”

Link to GEE script: GEE script

What could have gone wrong and How do I deal with this?