this error when i try to print the report 

QWebException: "'NoneType' object is not callable" while evaluating
'getRecords(l)'

report_selector_temp.xml

<tr t-foreach="o.record_ids" t-as="l">
    <td>
        <strong><span t-field="l.model_object_field"/></strong>
    </td>
    <td>
        <strong><span t-field="l.user_field"/></strong>
    </td>
    <td>
        <strong><span t-field="l.sequence"/></strong>
    </td>
       <td class="text-right">
    </td>
    <tr t-foreach="getRecord(l)" t-as="record">
        <td>
            <span t-esc="record"/>
        </td>
        <td>
        <strong><span t-field="l.user_field"/></strong>
        </td>
        <td>
            <strong><span t-field="l.sequence"/></strong>
        </td>
 

report_xml.py 

class modelgenerator(report_sxw.rml_parse):
    def __init__(self, cr, uid, name, context):
        super(modelgenerator, self).__init__(cr, uid, name, context=context)
        self.localcontext.update({
            'getRecord': self._records_get,
        })
        self.context = context



    def _records_get(self,line):
         
        model_obj = self.pool.get(line.report_generator_id.model_id.model)
        model_ids = model_obj.search(self.cr,self.uid,[])
        model_data_ids = model_obj.browse(self.cr,self.uid,model_ids)
        line_field_records = model_data_ids.mapped(line.model_object_field.name)
        return line_field_records


class report_selector(models.AbstractModel):
    _name = 'xsl.report.files.report_selector_docs'
    _inherit = 'report.abstract_report'
    _template = 'report_selector_docs'
    _wrapped_report_class = modelgenerator