Hi. Getting an error when run this compute function. Please help...

for record in self:

    if record.x_studio_check_in:

        if record['x_studio_history_2']==False:

            record['x_studio_history_2']=str(self['x_studio_employee'].name + '    │    ') + str(record.x_studio_checked_in_date) + '    │    '+"\n"

        else:

            record['x_studio_history_2']=str(self['x_studio_history_2']) + (str(self['x_studio_employee'].name + '    │    ') + str(record.x_studio_checked_out_date) + '    │    ')+"\n"

Te error is:

Odoo Server Error

RPC_ERROR

Odoo Server Error

Occured on romco-machine-service-llc.odoo.com on model x_equipment and id 11 on 2025-03-15 00:41:15 GMT

Traceback (most recent call last):
  File "/home/odoo/src/odoo/18.0/odoo/tools/safe_eval.py", line 397, in safe_eval
    return unsafe_eval(c, globals_dict, locals_dict)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "", line 6, in <module>
TypeError: unsupported operand type(s) for +: 'bool' and 'str'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/odoo/src/odoo/18.0/odoo/http.py", line 1962, in _transactioning
    return service_model.retrying(func, env=self.env)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/odoo/src/odoo/18.0/odoo/service/model.py", line 158, in retrying
    env.cr.flush()  # submit the changes to the database
    ^^^^^^^^^^^^^^
  File "/home/odoo/src/odoo/18.0/odoo/sql_db.py", line 159, in flush
    self.transaction.flush()
  File "/home/odoo/src/odoo/18.0/odoo/api.py", line 1022, in flush
    env_to_flush.flush_all()
  File "/home/odoo/src/odoo/18.0/odoo/api.py", line 847, in flush_all
    self._recompute_all()
  File "/home/odoo/src/odoo/18.0/odoo/api.py", line 843, in _recompute_all
    self[field.model_name]._recompute_field(field)
  File "/home/odoo/src/odoo/18.0/odoo/models.py", line 7311, in _recompute_field
    field.recompute(records)
  File "/home/odoo/src/odoo/18.0/odoo/fields.py", line 1463, in recompute
    apply_except_missing(self.compute_value, recs)
  File "/home/odoo/src/odoo/18.0/odoo/fields.py", line 1436, in apply_except_missing
    func(records)
  File "/home/odoo/src/odoo/18.0/odoo/fields.py", line 1485, in compute_value
    records._compute_field_value(self)
  File "/home/odoo/src/odoo/18.0/addons/mail/models/mail_thread.py", line 429, in _compute_field_value
    return super()._compute_field_value(field)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/odoo/src/odoo/18.0/odoo/models.py", line 5251, in _compute_field_value
    fields.determine(field.compute, self)
  File "/home/odoo/src/odoo/18.0/odoo/fields.py", line 113, in determine
    return needle(records, *args)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/home/odoo/src/odoo/18.0/odoo/addons/base/models/ir_model.py", line 49, in <lambda>
    func = lambda self: safe_eval(text, SAFE_EVAL_BASE, {'self': self}, mode="exec")
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/odoo/src/odoo/18.0/odoo/tools/safe_eval.py", line 411, in safe_eval
    raise ValueError('%r while evaluating\n%r' % (e, expr))
ValueError: TypeError("unsupported operand type(s) for +: 'bool' and 'str'") while evaluating
'for record in self:\n    if record.x_studio_check_in:\n        if record[\'x_studio_history_2\']==False:\n            record[\'x_studio_history_2\']=str(self[\'x_studio_employee\'].name + \'    │    \') + str(record.x_studio_checked_in_date) + \'    │    \'+"\\n"\n        else:\n            record[\'x_studio_history_2\']=str(self[\'x_studio_history_2\']) + (str(self[\'x_studio_employee\'].name + \'    │    \') + str(record.x_studio_checked_out_date) + \'    │    \')+"\\n"\n    '

The above server error caused the following client error:
RPC_ERROR: Odoo Server Error
    RPC_ERROR