Crone Job Issue

Hi All ,

I am new for Django Framework  , I need your help to fix this below issue
.I am trying to run cron job (python manage.py crontab add) but its
showing following error .

*System check identified some issues:*

*WARNINGS:*
*metric_db.note_appnav_table.updated: (fields.W161) Fixed default value
provided.*
*        HINT: It seems you set a fixed date / time / datetime value as
default for this field. This may not be what you want. If you want to have
the current date as default, use `django.utils.timezone.now`*
*metric_db.note_automatedreg_table.updated: (fields.W161) Fixed default
value provided.*
*        HINT: It seems you set a fixed date / time / datetime value as
default for this field. This may not be what you want. If you want to have
the current date as default, use `django.utils.timezone.now`*
*metric_db.note_autotest_table.updated: (fields.W161) Fixed default value
provided.*
*        HINT: It seems you set a fixed date / time / datetime value as
default for this field. This may not be what you want. If you want to have
the current date as default, use `django.utils.timezone.now`*
*metric_db.note_buffer_table.updated: (fields.W161) Fixed default value
provided.*
*        HINT: It seems you set a fixed date / time / datetime value as
default for this field. This may not be what you want. If you want to have
the current date as default, use `django.utils.timezone.now`*
*metric_db.note_featuredev_table.updated: (fields.W161) Fixed default value
provided.*
*        HINT: It seems you set a fixed date / time / datetime value as
default for this field. This may not be what you want. If you want to have
the current date as default, use `django.utils.timezone.now`*
*metric_db.note_hardening_table.updated: (fields.W161) Fixed default value
provided.*
*        HINT: It seems you set a fixed date / time / datetime value as
default for this field. This may not be what you want. If you want to have
the current date as default, use `django.utils.timezone.now`*
*metric_db.note_manualtest_table.updated: (fields.W161) Fixed default value
provided.*
*        HINT: It seems you set a fixed date / time / datetime value as
default for this field. This may not be what you want. If you want to have
the current date as default, use `django.utils.timezone.now`*
*metric_db.note_planned_table.updated: (fields.W161) Fixed default value
provided.*
*        HINT: It seems you set a fixed date / time / datetime value as
default for this field. This may not be what you want. If you want to have
the current date as default, use `django.utils.timezone.now`*
*metric_db.note_release_table.updated: (fields.W161) Fixed default value
provided.*
*        HINT: It seems you set a fixed date / time / datetime value as
default for this field. This may not be what you want. If you want to have
the current date as default, use `django.utils.timezone.now`*
*metric_db.note_sustanance_table.updated: (fields.W161) Fixed default value
provided.*
*        HINT: It seems you set a fixed date / time / datetime value as
default for this field. This may not be what you want. If you want to have
the current date as default, use `django.utils.timezone.*


*System configuration : *
OS: Linux
Python 2.7 and  Django version 1.8.3

I have tried multiple ways but no luck , Could you please help me to resolve this issue .

Thanks 
Syed 

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