Moves createError to subclass

annotator-core/src/main/java/edu/ucr/cs/riple/core/checkers/Checker.java

@@ -63,25 +63,6 @@ public interface Checker<T extends Error> {
    */
   void preprocess(AnnotationInjector injector);
 
-  /**
-   * Creates an {@link Error} instance from the given parameters.
-   *
-   * @param errorType Error type.
-   * @param errorMessage Error message.
-   * @param region Region where the error is reported,
-   * @param offset offset of program point in original version where error is reported.
-   * @param resolvingFixes Set of fixes that resolve the error.
-   * @param module Module where the error is reported.
-   * @return The corresponding error.
-   */
-  T createError(
-      String errorType,
-      String errorMessage,
-      Region region,
-      int offset,
-      ImmutableSet<Fix> resolvingFixes,
-      ModuleInfo module);
-
   /**
    * Verifies that the checker representation in Annotator is compatible with the actual running
    * checker on the target module.

annotator-core/src/main/java/edu/ucr/cs/riple/core/checkers/nullaway/NullAway.java

@@ -371,8 +371,7 @@ public void preprocess(AnnotationInjector injector) {
     injector.injectAnnotations(initializers);
   }
 
-  @Override
-  public NullAwayError createError(
+  private NullAwayError createError(
       String errorType,
       String errorMessage,
       Region region,