Do you know the Neo4j version?
Also given the error it may appear you have your conf/neo4j.conf import directory misconfigured and at the following config setting Configuration settings - Operations Manual Note this is a Neo4j v5x reference. If you are using Neo4j v4x the config setting is different.
Also have you configured Configuration settings - Operations Manual . Again a v5x config setting name and different if version v4x
The file is a relative path from the import directory. If you have not changed the default import directory in the neo4j.conf file, then you just place your file in the database's import folder and reference it as:
file:///filename.csv
You don't entire path. You can see in the error message how neo4j appended your entire path to the path to the database's import folder, thus it expects the file in the import folder.
Note: you spelled 'assignment' incorrectly in your file name.
You can load a csv from locations outside of your Neo4j import directory. You can do this, it's just not wise (security reasons). If you Absolutely Have To, the docs in the Neo4J web site that cover loading a cvs show you how and come with the warnings on why this is not a great idea. Hope this helps. thanks