Index: lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp
===================================================================
--- lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp
+++ lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp
@@ -1323,8 +1323,7 @@
       type_system_helper->DeclMap(); // result can be NULL
 
   if (decl_map) {
-    Target *target = exe_ctx.GetTargetPtr();
-    auto &error_stream = target->GetDebugger().GetErrorStream();
+    StreamString error_stream;
     IRForTarget ir_for_target(decl_map, m_expr.NeedsVariableResolution(),
                               *execution_unit_sp, error_stream,
                               function_name.AsCString());
@@ -1333,8 +1332,7 @@
         ir_for_target.runOnModule(*execution_unit_sp->GetModule());
 
     if (!ir_can_run) {
-      err.SetErrorString(
-          "The expression could not be prepared to run in the target");
+      err.SetErrorString(error_stream.GetString());
       return err;
     }
 
Index: lldb/test/API/lang/objc/modules-non-objc-target/TestObjCModulesNonObjCTarget.py
===================================================================
--- lldb/test/API/lang/objc/modules-non-objc-target/TestObjCModulesNonObjCTarget.py
+++ lldb/test/API/lang/objc/modules-non-objc-target/TestObjCModulesNonObjCTarget.py
@@ -23,4 +23,4 @@
         # be prepared to run in the target but it should at least not crash LLDB.
         self.expect('expr --lang objc -- [NSString stringWithFormat:@"%d", 1];',
                     error=True,
-                    substrs=["error: The expression could not be prepared to run in the target"])
+                    substrs=["Rewriting an Objective-C constant string requires CFStringCreateWithBytes"])