I'm trying to practice SQL and run a file from my textbook for my class, but it is not working when I put in the path which I copied and pasted in. The pictures are of what happened the various times I tried. Do you know what could be wrong?

SQL Plus SQL*Plus: Release 18.0.0.0.0 - Production on Tue Feb 2 15:38:35 2021 Version 18.4.0.0.0 Copyright (c) 1982, 2018, Oracle. All rights reserved. Enter user-name: system Enter password: Last Successful login time: Mon Feb 01 2021 20:00:53 -05:00 Connected to: Oracle Database 18c Express Edition Release 18.0.0.0.0 - Production Version 18.4.0.0.0 SQL> start C:\Users\Cyndal\Desktop\School_Stuff\450-Data_Files\JLDB_Build.sql Table created. 1 row created. 1 row created. 1 row created 1 row created. 1 row created. 1 row created. 1 row created. 1 row created. 1 row created. Type here to search o j . D ) 4:15 PM 2/2/2021 3 SQL Plus x Close SQL*Plus: Release 18.0.0.0.0 - Production on Tue Feb 2 20:04:30 2021 Version 18.4.0.0.0 Copyright (c) 1982, 2018, Oracle. All rights reserved. Enter user-name: system Enter password: Last Successful login time: Tue Feb 02 2021 19:55:42 -05:00 Connected to: Oracle Database 18c Express Edition Release 18.0.0.0.0 - Production Version 18.4.0.0.0 SQL> @C:\Users\Cyndal\Desktop\School_Stuff 450-Data_Files\JLDB_Build.sql; CREATE TABLE Customers ERROR at line 1: ORA-00955: name is already used by an existing object INSERT INTO CUSTOMERS ERROR at line 1: ORA-00001: unique constraint (SYSTEM.CUSTOMERS_CUSTOMER#_PK) violated INSERT INTO CUSTOMERS ERROR at line 1: ORA-00001: unique constraint (SYSTEM.CUSTOMERS_CUSTOMER#_PK) violated INSERT INTO CUSTOMERS * ERROR at line 1: ORA-00001: unique constraint (SYSTEM.CUSTOMERS_CUSTOMER#_PK) violated INSERT INTO CUSTOMERS ERROR at line 1: ORA-00001: unique constraint (SYSTEM.CUSTOMERS_CUSTOMER#_PK) violated Type here to search . ) 8:07 PM 2/2/2021