I'm using Odoo Online and i can't use a third party app to implement the google tag manager. 

I tried to do it myself by putting the code in the header and in the body of the Web_layout. I also changed the "&" to "&" but, unfortunately i got four error messages (see below).  

Has anyone experienced the same error messages ? and how were you able to solve it ? 

Thank you, 

Error 1 : 

Traceback:

TypeError: Cannot read property 'user_context' of undefined

    at Object.loadAsset (https://www.lavitrinelocale.be/web/static/src/js/core/ajax.js:447:50)

    at https://www.lavitrinelocale.be/web/static/src/js/core/ajax.js:544:25

    at https://www.lavitrinelocale.be/web/static/src/js/core/ajax.js:555:28

    at https://www.lavitrinelocale.be/web/static/src/js/core/concurrency.js:195:30

Error2 : 

Error:

Uncaught TypeError: odoo.define is not a function

https://www.lavitrinelocale.be/:1307

Traceback:

TypeError: odoo.define is not a function

    at https://www.lavitrinelocale.be/:1307:26

Error3 :

Error:

Uncaught TypeError: Cannot read property 'services' of undefined

https://www.lavitrinelocale.be/web/static/lib/jquery/jquery.js:3827

Traceback:

TypeError: Cannot read property 'services' of undefined

    at HTMLDocument.<anonymous> (https://www.lavitrinelocale.be/saas_website/static/src/js/db_activation_reminder.js:7:26)

    at mightThrow (https://www.lavitrinelocale.be/web/static/lib/jquery/jquery.js:3534:29)

    at process (https://www.lavitrinelocale.be/web/static/lib/jquery/jquery.js:3602:12)

Error4 :

Error:

Uncaught TypeError: odoo.define is not a function

https://www.lavitrinelocale.be/web/static/lib/jquery/jquery.js:3827

Traceback:

TypeError: odoo.define is not a function

    at HTMLDocument.<anonymous> (https://www.lavitrinelocale.be/saas_trial/static/js/activation.js:6:6)

    at mightThrow (https://www.lavitrinelocale.be/web/static/lib/jquery/jquery.js:3534:29)

    at process (https://www.lavitrinelocale.be/web/static/lib/jquery/jquery.js:3602:12)