tokens: The above exception is a server side exception with 500 response code so if we put the source code inside a try catch block , the error should be caught in catch block , but try catch does not work for this scenario .
ner_tags: O O B-Class O O O O B-Class O B-Error_Name O O O O O O O O O O O B-Code_Block I-Code_Block O O O O O O O O B-Code_Block O O O B-Code_Block I-Code_Block O O O O O O O