Error Messages:

ErrorMessage: Swashbuckle.AspNetCore.SwaggerGen.SwaggerGeneratorException: Failed to generate Operation for action - PMToolkit.API.Controllers.ReportController.GetOrderReportFilesList (PMToolkit.API). See inner exception\r\n ---\u003E Swashbuckle.AspNetCore.SwaggerGen.SwaggerGeneratorException: Failed to generate schema for type - System.Collections.Generic.IEnumerable\u00601[PMToolkit.API.Database.Models.OrderReportFile]. See inner exception\r\n ---\u003E System.InvalidOperationException: Can\u0027t use schemaId \u0022$OrderOption\u0022 for type \u0022$PMToolkit.API.Database.OrderOption\u0022. The same schemaId is already used for type \u0022$PMToolkit.API.Controllers.DelayOrdersController\u002BOrderOption\u0022\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SchemaRepository.RegisterType(Type type, String schemaId)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateReferencedSchema(DataContract dataContract, SchemaRepository schemaRepository, Func\u00601 definitionFactory)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateConcreteSchema(DataContract dataContract, SchemaRepository schemaRepository)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateSchemaForMember(Type modelType, SchemaRepository schemaRepository, MemberInfo memberInfo, DataProperty dataProperty)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.CreateObjectSchema(DataContract dataContract, SchemaRepository schemaRepository)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.\u003C\u003Ec__DisplayClass10_0.\u003CGenerateConcreteSchema\u003Eb__3()\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateReferencedSchema(DataContract dataContract, SchemaRepository schemaRepository, Func\u00601 definitionFactory)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateConcreteSchema(DataContract dataContract, SchemaRepository schemaRepository)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateSchemaForType(Type modelType, SchemaRepository schemaRepository)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateSchema(Type modelType, SchemaRepository schemaRepository, MemberInfo memberInfo, ParameterInfo parameterInfo)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.CreateArraySchema(DataContract dataContract, SchemaRepository schemaRepository)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.\u003C\u003Ec__DisplayClass10_0.\u003CGenerateConcreteSchema\u003Eb__1()\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateConcreteSchema(DataContract dataContract, SchemaRepository schemaRepository)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateSchemaForType(Type modelType, SchemaRepository schemaRepository)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateSchema(Type modelType, SchemaRepository schemaRepository, MemberInfo memberInfo, ParameterInfo parameterInfo)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GenerateSchema(Type type, SchemaRepository schemaRepository, PropertyInfo propertyInfo, ParameterInfo parameterInfo)\r\n   --- End of inner exception stack trace ---\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GenerateSchema(Type type, SchemaRepository schemaRepository, PropertyInfo propertyInfo, ParameterInfo parameterInfo)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.CreateResponseMediaType(ModelMetadata modelMetadata, SchemaRepository schemaRespository)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.\u003C\u003Ec__DisplayClass19_0.\u003CGenerateResponse\u003Eb__2(String contentType)\r\n   at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable\u00601 source, Func\u00602 keySelector, Func\u00602 elementSelector, IEqualityComparer\u00601 comparer)\r\n   at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable\u00601 source, Func\u00602 keySelector, Func\u00602 elementSelector)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GenerateResponse(ApiDescription apiDescription, SchemaRepository schemaRepository, String statusCode, ApiResponseType apiResponseType)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GenerateResponses(ApiDescription apiDescription, SchemaRepository schemaRepository)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GenerateOperation(ApiDescription apiDescription, SchemaRepository schemaRepository)\r\n   --- End of inner exception stack trace ---\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GenerateOperation(ApiDescription apiDescription, SchemaRepository schemaRepository)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GenerateOperations(IEnumerable\u00601 apiDescriptions, SchemaRepository schemaRepository)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GeneratePaths(IEnumerable\u00601 apiDescriptions, SchemaRepository schemaRepository)\r\n   at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GetSwagger(String documentName, String host, String basePath)\r\n   at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)\r\n   at Steeltoe.Management.Endpoint.CloudFoundry.CloudFoundrySecurityMiddleware.Invoke(HttpContext context)\r\n   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context).

 

Solution:
You must add a swagger config as below:

services.ConfigureSwaggerGen(opt =>
{
	opt.CustomSchemaIds(x => x.FullName);
});