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"How to filter examples with attributes with same value"
EDIT: I realized that actually there is an option to set conditions over several attributes. However, when I run the process, I get a message error that says this:
"Cannot instantiate 'expression': Expression 'Material=Material2' does not evaluate to a boolean value!
Some operators instantiate classes specified by the user. This may cause errors for mainly two reasons: The class cannot be found because it is not in the classpath or misspelled or the classes constructor or initializer throws an exception. Always use the fully qualified classnames.
Reason:Expression 'Material'='Material2' does not evaluate a boolean value!"
I dont understand anything about what it says, what does that mean? How can I solve it? Thanks you