java.lang.IllegalArgumentException: Null input buffer

[cesarcastmore]

We are using this library to encrypt a text with a private key and with a public key we are verifying the integrity of the text.
I have attached a zip file, inside resources, I have four files. two private keys and two private keys. The class that runs the project is called SelloSuccessTest.java and SelloFailtureTest.java

If the SelloSuccessTest class is run, the code executes successfully.
mvn test -Dtest=SelloSuccessTest

If the SelloFailtureTest class is run, the code does not run successfully and returns an error.
mvn test -Dtest=SelloFailtureTest
java.lang.IllegalArgumentException: Null input buffer
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check-sellos.zip

Could you help us?