'Field required a bean of type that could not be found.' error spring restful API using mongodb

The 'Field required a bean of type that could not be found' error in a Spring application typically indicates that the application is trying to inject a dependency into a field, but it cannot find a bean of the required type in the application context.

There are several possible causes for this error:

1. The bean that you are trying to inject has not been defined in the application context. Make sure that you have defined a bean of the required type in your configuration, either using annotations or XML.

2. You are using component scanning to detect beans in your application, but the package that contains the required bean has not been included in the scan. Make sure that you have included the correct package in the @ComponentScan annotation.

3. You are using a third-party library that defines the required bean, but the library is not on the classpath. Make sure that you have included the library in your build dependencies.

4. You are using a @Qualifier annotation to specify a specific bean to inject, but there are multiple beans of the same type in the application context and the @Qualifier value does not match any of them. Make sure that you have specified the correct @Qualifier value.

I hope this helps! Let me know if you have any questions.