It is error I get while installing a the module and it happen to multiple modules 
Odoo Server Error

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/odoo/tools/convert.py", line 712, in parse
    self._tag_root(de)
  File "/usr/lib/python3/dist-packages/odoo/tools/convert.py", line 674, in _tag_root
    f(rec)
  File "/usr/lib/python3/dist-packages/odoo/tools/convert.py", line 577, in _tag_record
    record = model._load_records([data], self.mode == 'update')
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 4195, in _load_records
    records = self._load_records_create([data['values'] for data in to_create])
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 4101, in _load_records_create
    return self.create(values)
  File "", line 2, in create
  File "/usr/lib/python3/dist-packages/odoo/api.py", line 339, in _model_create_multi
    return create(self, arg)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 475, in create
    return super(View, self).create(vals_list)
  File "", line 2, in create
  File "/usr/lib/python3/dist-packages/odoo/api.py", line 339, in _model_create_multi
    return create(self, arg)
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 3858, in create
    fields[0].determine_inverse(batch_recs)
  File "/usr/lib/python3/dist-packages/odoo/fields.py", line 1156, in determine_inverse
    getattr(records, self.inverse)()
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 299, in _inverse_arch
    view.write(data)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 493, in write
    res = super(View, self).write(self._compute_defaults(vals))
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 3647, in write
    real_recs._validate_fields(vals, inverse_fields)
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 1212, in _validate_fields
    check(self)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 385, in _check_xml
    view_arch = etree.fromstring(view.arch.encode('utf-8'))
  File "src/lxml/etree.pyx", line 3235, in lxml.etree.fromstring
  File "src/lxml/parser.pxi", line 1876, in lxml.etree._parseMemoryDocument
  File "src/lxml/parser.pxi", line 1764, in lxml.etree._parseDoc
  File "src/lxml/parser.pxi", line 1127, in lxml.etree._BaseParser._parseDoc
  File "src/lxml/parser.pxi", line 601, in lxml.etree._ParserContext._handleParseResultDoc
  File "src/lxml/parser.pxi", line 711, in lxml.etree._handleParseResult
  File "src/lxml/parser.pxi", line 640, in lxml.etree._raiseParseError
  File "", line 8