diff --git a/src/main/java/com/powsybl/openloadflow/knitro/solver/NonLinearExternalSolverUtils.java b/src/main/java/com/powsybl/openloadflow/knitro/solver/NonLinearExternalSolverUtils.java
index 2046cea..868996c 100644
--- a/src/main/java/com/powsybl/openloadflow/knitro/solver/NonLinearExternalSolverUtils.java
+++ b/src/main/java/com/powsybl/openloadflow/knitro/solver/NonLinearExternalSolverUtils.java
@@ -11,7 +11,6 @@
 import com.powsybl.openloadflow.ac.equations.AcEquationType;
 import com.powsybl.openloadflow.equations.EquationTerm;
 import com.powsybl.openloadflow.equations.VariableEquationTerm;
-import com.sun.jdi.InvalidTypeException;
 
 import java.util.*;