diff --git a/core/src/main/java/org/nwapw/abacus/number/DomainException.java b/core/src/main/java/org/nwapw/abacus/function/DomainException.java
similarity index 93%
rename from core/src/main/java/org/nwapw/abacus/number/DomainException.java
rename to core/src/main/java/org/nwapw/abacus/function/DomainException.java
index 51a1769..a7a449c 100644
--- a/core/src/main/java/org/nwapw/abacus/number/DomainException.java
+++ b/core/src/main/java/org/nwapw/abacus/function/DomainException.java
@@ -1,4 +1,4 @@
-package org.nwapw.abacus.number;
+package org.nwapw.abacus.function;
 
 /**
  * Exception thrown if the function parameters do not match
diff --git a/core/src/main/kotlin/org/nwapw/abacus/function/applicable/Applicable.kt b/core/src/main/kotlin/org/nwapw/abacus/function/applicable/Applicable.kt
index dce1129..ed8bb91 100644
--- a/core/src/main/kotlin/org/nwapw/abacus/function/applicable/Applicable.kt
+++ b/core/src/main/kotlin/org/nwapw/abacus/function/applicable/Applicable.kt
@@ -1,6 +1,6 @@
 package org.nwapw.abacus.function.applicable
 
-import org.nwapw.abacus.number.DomainException
+import org.nwapw.abacus.function.DomainException
 import org.nwapw.abacus.plugin.NumberImplementation
 
 /**
diff --git a/core/src/main/kotlin/org/nwapw/abacus/function/applicable/ReducerApplicable.kt b/core/src/main/kotlin/org/nwapw/abacus/function/applicable/ReducerApplicable.kt
index 9a80edc..54340a4 100644
--- a/core/src/main/kotlin/org/nwapw/abacus/function/applicable/ReducerApplicable.kt
+++ b/core/src/main/kotlin/org/nwapw/abacus/function/applicable/ReducerApplicable.kt
@@ -1,6 +1,6 @@
 package org.nwapw.abacus.function.applicable
 
-import org.nwapw.abacus.number.DomainException
+import org.nwapw.abacus.function.DomainException
 import org.nwapw.abacus.plugin.NumberImplementation
 import org.nwapw.abacus.tree.Reducer
 
diff --git a/core/src/test/java/org/nwapw/abacus/tests/CalculationTests.java b/core/src/test/java/org/nwapw/abacus/tests/CalculationTests.java
index 3d3269e..39cf091 100755
--- a/core/src/test/java/org/nwapw/abacus/tests/CalculationTests.java
+++ b/core/src/test/java/org/nwapw/abacus/tests/CalculationTests.java
@@ -5,7 +5,7 @@ import org.junit.BeforeClass;
 import org.junit.Test;
 import org.nwapw.abacus.Abacus;
 import org.nwapw.abacus.config.Configuration;
-import org.nwapw.abacus.number.DomainException;
+import org.nwapw.abacus.function.DomainException;
 import org.nwapw.abacus.number.NumberInterface;
 import org.nwapw.abacus.plugin.StandardPlugin;
 import org.nwapw.abacus.tree.TreeNode;
diff --git a/fx/src/main/java/org/nwapw/abacus/fx/AbacusController.java b/fx/src/main/java/org/nwapw/abacus/fx/AbacusController.java
index 45cdf76..8b05f3f 100644
--- a/fx/src/main/java/org/nwapw/abacus/fx/AbacusController.java
+++ b/fx/src/main/java/org/nwapw/abacus/fx/AbacusController.java
@@ -14,6 +14,7 @@ import org.nwapw.abacus.Abacus;
 import org.nwapw.abacus.config.Configuration;
 import org.nwapw.abacus.function.Documentation;
 import org.nwapw.abacus.function.DocumentationType;
+import org.nwapw.abacus.function.DomainException;
 import org.nwapw.abacus.number.*;
 import org.nwapw.abacus.plugin.ClassFinder;
 import org.nwapw.abacus.plugin.PluginListener;