error: method save in interface CrudRepository<T,ID> cannot be applied to given types; courses.save(bunchOfCourses);

C:\course-reviews-api\src\main\java\com\teamtreehouse\core\DatabaseLoader.java:54: error: method save in interface CrudRepository<T,ID> cannot be applied to given types;
        courses.save(bunchOfCourses);
               ^
  required: S
  found: List<Course>
  reason: inferred type does not conform to upper bound(s)
    inferred: List<Course>
    upper bound(s): Course
  where S,T,ID are type-variables:
    S extends Course declared in method <S>save(S)
    T extends Object declared in interface CrudRepository
    ID extends Object declared in interface CrudRepository

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:2.0.0.RELEASE")
    }
}

apply plugin: 'java'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'

bootJar {
    baseName = 'gs-accessing-data-rest'
    version = '0.1.0'
}

repositories {
    mavenCentral()
}

sourceCompatibility = 1.8
targetCompatibility = 1.8

dependencies {
    compile("org.springframework.boot:spring-boot-starter-data-rest")
    compile("org.springframework.boot:spring-boot-starter-data-jpa")
    compile("com.h2database:h2")
    testCompile("org.springframework.boot:spring-boot-starter-test")
}