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MATLAB Interface to Neo4j Error Messages

Both the MATLAB® interface to Neo4j® and the Neo4j database return error messages.

The Neo4j database error messages always have a status code that starts with: Neo.ClientError. To troubleshoot these errors, consult the Neo4j Documentation.

The MATLAB interface to Neo4j returns error messages in plain text. This table describes how to address common errors you can encounter while working with the MATLAB interface to Neo4j.

Error MessageProbable CausesResolution

Invalid connection.

The Neo4j database connection is invalid.

Connect to the Neo4j database using neo4j.

Unable to connect. Please try again.

The Neo4j database connection is invalid.

Connect to the Neo4j database using neo4j.

No Nodes found with matching criteria.

The search cannot find nodes for the specified node label or property keys and values.

Verify the node label or property keys and values. Then, run searchNode.

Unable to find “relationship” relationships for node with id “node identifier” in database.

The search cannot find relationships for the specified relationships and node in the Neo4j database.

Verify the origin node and direction. Then, run searchRelation.

No node labels found.

The Neo4j database has no node labels.

Open the Neo4j database and add node labels. For details, see the Neo4j Operations Manual in the Neo4j Documentation. Then, run nodeLabels.

No relationship types found.

The Neo4j database has no relationship types.

Open the Neo4j database and add relationship types. For details, see the Neo4j Operations Manual in the Neo4j Documentation. Then, run relationTypes.

No property keys found.

The Neo4j database has no property keys.

Open the Neo4j database and add property keys. For details, see the Neo4j Operations Manual in the Neo4j Documentation. Then, run propertyKeys.

Unable to execute Cypher® query.

The Cypher query is invalid.

Verify the Cypher query. Then, run executeCypher. For details about writing Cypher queries, see Cypher Query Language.

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