Rasa forms issue

im new to rasa and im trying to use a very simple form collecting customer name and mobile and email but when i train the model i got this issue

2021-09-10 17:07:29 INFO numexpr.utils - NumExpr defaulting to 4 threads. The configuration for pipeline and policies was chosen automatically. It was written into the config file at ‘config.yml’. YamlValidationException: Failed to validate ‘c:\Users\mglall\rasa_csr\domain.yml’. Please make sure the file is correct and all mandatory parameters are specified. Here are the errors found during validation: in c:\Users\mglall\rasa_csr\domain.yml:83: <SchemaError: error code 2: Missing ‘text’ or ‘custom’ key in response or null ‘text’ value in response.: Path: ‘/’>. Path: /responses/forms in c:\Users\mglall\rasa_csr\domain.yml:83: Key ‘requesting_callback’ was not defined. Path: '/responses/forms/0’

my domain file slots and entities stories 4

@mglall can you please even share the screenshot of error and even some related code snippet for the same. Thanks.