Invalid input 'x': expected 'n/N' (line 1, column 227 (offset: 226))

Neo4j Graph Platform Cypher
1

I am new to NEO4j and have been getting many errors and trouble while trying to learn cypher.
How can I learn cypher properly?

I have been facing error while trying to load a csv file can anyone tell me what i have been doing wrong?

LOAD CSV WITH HEADERS FROM "file:///C:/Users/sitas/AppData/Local/Neo4j/Relate/Data/dbmss/dbms-a5c6a64c-958c-47c9-9068-d1e74d5258ca/import/Experiment_Design.csv" AS line with line merge(Aid:AIdNode{Name:line.analytical_sample external_id}) merge(Sid:SIdNode{Name:line.subject external_id}) merge(g2:G2Node{Name:line.grouping2}) merge(g1:G1Node{Name:line.grouping1}) merge(Bid:BIdNode{Name:line.biological_sample external_id});

Error:

Invalid input 'x': expected 'n/N' (line 1, column 227 (offset: 226))
"LOAD CSV WITH HEADERS FROM "file:///C:/Users/sitas/AppData/Local/Neo4j/Relate/Data/dbmss/dbms-a5c6a64c-958c-47c9-9068-d1e74d5258ca/import/Experiment_Design.csv" AS line with line merge(Aid:AIdNode{Name:line.analytical_sample external_id}) merge(Sid:SIdNode{Name:line.subject external_id}) merge(g2:G2Node{Name:line.grouping2}) merge(g1:G1Node{Name:line.grouping1}) merge(Bid:BIdNode{Name:line.biological_sample external_id}) ;"