hugegraph-loader/src/main/java/org/apache/hugegraph/loader/mapping/EdgeMapping.java [56:66]:
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    public void check() throws IllegalArgumentException {
        super.check();
        E.checkArgument(this.sourceFields != null &&
                        !this.sourceFields.isEmpty(),
                        "The source field of edge label '%s' " +
                        "can't be null or empty", this.label());
        E.checkArgument(this.targetFields != null &&
                        !this.targetFields.isEmpty(),
                        "The target field of edge label '%s' " +
                        "can't be null or empty", this.label());
    }
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hugegraph-loader/src/main/java/org/apache/hugegraph/loader/struct/EdgeStructV1.java [57:67]:
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    public void check() throws IllegalArgumentException {
        super.check();
        E.checkArgument(this.sourceFields != null &&
                        !this.sourceFields.isEmpty(),
                        "The source field of edge label '%s' " +
                        "can't be null or empty", this.label());
        E.checkArgument(this.targetFields != null &&
                        !this.targetFields.isEmpty(),
                        "The target field of edge label '%s' " +
                        "can't be null or empty", this.label());
    }
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