fix compilation: change exception type to plain Error instead of SolverException.

This change avoids an API change (that was already reverted before).
CVC4 runs (or is) out of support and the related issue with Unicode strings will not be fixed.

Author: kfriedberger

src/org/sosy_lab/java_smt/solvers/cvc4/CVC4TheoremProver.java

@@ -124,8 +124,7 @@ protected void popImpl() {
   }
 
   @Override
-  protected @Nullable Void addConstraintImpl(BooleanFormula pF)
-      throws InterruptedException, SolverException {
+  protected @Nullable Void addConstraintImpl(BooleanFormula pF) throws InterruptedException {
     Preconditions.checkState(!closed);
     setChanged();
     if (incremental) {
@@ -134,11 +133,11 @@ protected void popImpl() {
     return null;
   }
 
-  private void assertFormula(BooleanFormula pF) throws SolverException {
+  private void assertFormula(BooleanFormula pF) {
     try {
       smtEngine.assertFormula(importExpr(creator.extractInfo(pF)));
     } catch (Exception cvc4Exception) {
-      throw new SolverException(
+      throw new AssertionError(
           String.format("CVC4 crashed while adding the constraint '%s'", pF), cvc4Exception);
     }
   }