diff --git a/src/content/ContentPack.cpp b/src/content/ContentPack.cpp
index 372ec84a..ca6dbdd9 100644
--- a/src/content/ContentPack.cpp
+++ b/src/content/ContentPack.cpp
@@ -1,7 +1,6 @@
 #include "ContentPack.h"
 
 #include <iostream>
-#include <stdexcept>
 
 #include "../coders/json.h"
 #include "../files/files.h"
@@ -12,6 +11,20 @@ namespace fs = std::filesystem;
 const std::string ContentPack::PACKAGE_FILENAME = "package.json";
 const std::string ContentPack::CONTENT_FILENAME = "content.json";
 
+contentpack_error::contentpack_error(
+    std::string packId, 
+    std::filesystem::path folder, 
+    std::string message)
+    : std::runtime_error(message), packId(packId), folder(folder) {
+}
+
+std::string contentpack_error::getPackId() const {
+    return packId;
+}
+std::filesystem::path contentpack_error::getFolder() const {
+    return folder;
+}
+
 std::filesystem::path ContentPack::getContentFile() const {
     return folder/fs::path(CONTENT_FILENAME);
 }
@@ -28,7 +41,7 @@ ContentPack ContentPack::read(std::filesystem::path folder) {
     root->str("version", pack.version);
     pack.folder = folder;
     if (pack.id == "none")
-        throw std::runtime_error("content-pack id is none: "+folder.u8string());
+        throw contentpack_error(pack.id, folder, "content-pack id is none");
     return pack;
 }
 
@@ -60,7 +73,8 @@ std::vector<std::string> ContentPack::worldPacksList(fs::path folder) {
 fs::path ContentPack::findPack(const EnginePaths* paths, std::string name) {
     auto folder = paths->getResources() / fs::path("content") / fs::path(name);
     if (!fs::is_directory(folder)) {
-        throw std::runtime_error("could not to find pack '"+name+"'");
+        throw contentpack_error(name, folder, 
+                                "could not to find pack '"+name+"'");
     }
     return folder;
 }
diff --git a/src/content/ContentPack.h b/src/content/ContentPack.h
index 23814d3c..37e85ee8 100644
--- a/src/content/ContentPack.h
+++ b/src/content/ContentPack.h
@@ -3,10 +3,23 @@
 
 #include <string>
 #include <vector>
+#include <stdexcept>
 #include <filesystem>
 
 class EnginePaths;
 
+class contentpack_error : public std::runtime_error {
+    std::string packId;
+    std::filesystem::path folder;
+public:
+    contentpack_error(std::string packId, 
+                      std::filesystem::path folder, 
+                      std::string message);
+
+    std::string getPackId() const;
+    std::filesystem::path getFolder() const;
+};
+
 struct ContentPack {
     std::string id = "none";
     std::string title = "untitled";
diff --git a/src/engine.cpp b/src/engine.cpp
index 23c72787..8a4eecce 100644
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -203,5 +203,4 @@ void Engine::loadAllPacks() {
 	auto resdir = paths->getResources();
 	contentPacks.clear();
 	ContentPack::scan(resdir/fs::path("content"), contentPacks);
-	loadContent();
 }
diff --git a/src/frontend/menu.cpp b/src/frontend/menu.cpp
index aaada578..41486f72 100644
--- a/src/frontend/menu.cpp
+++ b/src/frontend/menu.cpp
@@ -156,16 +156,16 @@ void open_world(std::string name, Engine* engine) {
     packs.clear();
     auto packnames = ContentPack::worldPacksList(folder);
     for (auto name : packnames) {
-        fs::path packfolder;
         try {
-            packfolder = ContentPack::findPack(paths, name);
-        } catch (std::runtime_error& error) {
+            fs::path packfolder = ContentPack::findPack(paths, name);
+            packs.push_back(ContentPack::read(packfolder));
+        } catch (contentpack_error& error) {
+            // could not to find or read pack
             guiutil::alert(engine->getGUI(), 
                            langs::get(L"error.pack-not-found")+
-                           L": "+util::str2wstr_utf8(name));
+                           L": "+util::str2wstr_utf8(error.getPackId()));
             return;
         }
-        packs.push_back(ContentPack::read(packfolder));
     }
     engine->loadContent();
 
@@ -291,6 +291,7 @@ void create_new_world_panel(Engine* engine, PagesControl* menu) {
         fs::create_directories(folder);
 
         engine->loadAllPacks();
+        engine->loadContent();
         Level* level = World::create(nameutf8, 
                                      folder, 
                                      seed,