Edit error in SampleController

.idea/compiler.xml

.idea/encodings.xml

...ibraries/Maven__ch_qos_logback_logback_classic_1_1_11.xml

...a/libraries/Maven__ch_qos_logback_logback_core_1_1_11.xml

.idea/libraries/Maven__com_fasterxml_classmate_1_3_4.xml

..._com_fasterxml_jackson_core_jackson_annotations_2_8_0.xml

...Maven__com_fasterxml_jackson_core_jackson_core_2_8_10.xml

...n__com_fasterxml_jackson_core_jackson_databind_2_8_10.xml

...es/Maven__javax_validation_validation_api_1_1_0_Final.xml

...ven__org_apache_tomcat_embed_tomcat_embed_core_8_5_20.xml

...Maven__org_apache_tomcat_embed_tomcat_embed_el_8_5_20.xml

...org_apache_tomcat_embed_tomcat_embed_websocket_8_5_20.xml

.../Maven__org_hibernate_hibernate_validator_5_3_5_Final.xml

...es/Maven__org_jboss_logging_jboss_logging_3_3_1_Final.xml

.idea/libraries/Maven__org_slf4j_jcl_over_slf4j_1_7_25.xml

.idea/libraries/Maven__org_slf4j_jul_to_slf4j_1_7_25.xml

.idea/libraries/Maven__org_slf4j_log4j_over_slf4j_1_7_25.xml

.idea/libraries/Maven__org_slf4j_slf4j_api_1_7_25.xml

...n__org_springframework_boot_spring_boot_1_5_7_RELEASE.xml

...ringframework_boot_spring_boot_actuator_1_5_7_RELEASE.xml