diff --git a/examples/completeExample/completeExample.cpp b/examples/completeExample/completeExample.cpp
index 7617e94..6833310 100644
--- a/examples/completeExample/completeExample.cpp
+++ b/examples/completeExample/completeExample.cpp
@@ -30,15 +30,17 @@
 #include <ESP8266WiFi.h>
 #include <ESP8266mDNS.h>
 #include <umm_malloc/umm_heap_select.h>
+#ifndef CORE_MOCK
 #ifndef MMU_IRAM_HEAP
 #warning Try MMU option '2nd heap shared' in 'tools' IDE menu (cf. https://arduino-esp8266.readthedocs.io/en/latest/mmu.html#option-summary)
 #warning use decorators: { HeapSelectIram doAllocationsInIRAM; ESPUI.addControl(...) ... } (cf. https://arduino-esp8266.readthedocs.io/en/latest/mmu.html#how-to-select-heap)
 #warning then check http://<ip>/heap
 #endif // MMU_IRAM_HEAP
-#if !defined(DEBUG_ESP_OOM) && !defined(CORE_MOCK)
+#ifndef DEBUG_ESP_OOM
 #error on ESP8266 and ESPUI, you must define OOM debug option when developping
 #endif
 #endif
+#endif
 
 //Settings
 #define SLOW_BOOT 0
diff --git a/examples/gui-generic-api/gui-generic-api.ino b/examples/gui-generic-api/gui-generic-api.ino
index 54f003b..556596b 100644
--- a/examples/gui-generic-api/gui-generic-api.ino
+++ b/examples/gui-generic-api/gui-generic-api.ino
@@ -11,15 +11,17 @@ DNSServer dnsServer;
 // esp8266
 #include <ESP8266WiFi.h>
 #include <umm_malloc/umm_heap_select.h>
+#ifndef CORE_MOCK
 #ifndef MMU_IRAM_HEAP
 #warning Try MMU option '2nd heap shared' in 'tools' IDE menu (cf. https://arduino-esp8266.readthedocs.io/en/latest/mmu.html#option-summary)
 #warning use decorators: { HeapSelectIram doAllocationsInIRAM; ESPUI.addControl(...) ... } (cf. https://arduino-esp8266.readthedocs.io/en/latest/mmu.html#how-to-select-heap)
 #warning then check http://<ip>/heap
 #endif // MMU_IRAM_HEAP
-#if !defined(DEBUG_ESP_OOM) && !defined(CORE_MOCK)
+#if !defined(DEBUG_ESP_OOM)
 #error on ESP8266 and ESPUI, you must define OOM debug option when developping
 #endif
 #endif
+#endif
 
 const char* ssid = "ESPUI";
 const char* password = "espui";
@@ -68,7 +70,7 @@ void buttonCallback(Control* sender, int type)
 void buttonExample(Control* sender, int type, void* param)
 {
     Serial.print("param: ");
-    Serial.println(long(param));
+    Serial.println((long)param);
     switch (type)
     {
     case B_DOWN:
diff --git a/examples/gui/gui.ino b/examples/gui/gui.ino
index 759ed07..71ab831 100644
--- a/examples/gui/gui.ino
+++ b/examples/gui/gui.ino
@@ -11,15 +11,17 @@ DNSServer dnsServer;
 // esp8266
 #include <ESP8266WiFi.h>
 #include <umm_malloc/umm_heap_select.h>
+#ifndef CORE_MOCK
 #ifndef MMU_IRAM_HEAP
 #warning Try MMU option '2nd heap shared' in 'tools' IDE menu (cf. https://arduino-esp8266.readthedocs.io/en/latest/mmu.html#option-summary)
 #warning use decorators: { HeapSelectIram doAllocationsInIRAM; ESPUI.addControl(...) ... } (cf. https://arduino-esp8266.readthedocs.io/en/latest/mmu.html#how-to-select-heap)
 #warning then check http://<ip>/heap
 #endif // MMU_IRAM_HEAP
-#if !defined(DEBUG_ESP_OOM) && !defined(CORE_MOCK)
+#ifndef DEBUG_ESP_OOM
 #error on ESP8266 and ESPUI, you must define OOM debug option when developping
 #endif
 #endif
+#endif
 
 const char* ssid = "ESPUI";
 const char* password = "espui";
@@ -73,7 +75,7 @@ void buttonCallback(Control* sender, int type)
 void buttonExample(Control* sender, int type, void* param)
 {
     Serial.print("param: ");
-    Serial.println(long(param));
+    Serial.println((long)param);
     switch (type)
     {
     case B_DOWN:
diff --git a/examples/tabbedGui/tabbedGui.ino b/examples/tabbedGui/tabbedGui.ino
index a862aa9..4831a6b 100644
--- a/examples/tabbedGui/tabbedGui.ino
+++ b/examples/tabbedGui/tabbedGui.ino
@@ -11,15 +11,17 @@ DNSServer dnsServer;
 // esp8266
 #include <ESP8266WiFi.h>
 #include <umm_malloc/umm_heap_select.h>
+#ifndef CORE_MOCK
 #ifndef MMU_IRAM_HEAP
 #warning Try MMU option '2nd heap shared' in 'tools' IDE menu (cf. https://arduino-esp8266.readthedocs.io/en/latest/mmu.html#option-summary)
 #warning use decorators: { HeapSelectIram doAllocationsInIRAM; ESPUI.addControl(...) ... } (cf. https://arduino-esp8266.readthedocs.io/en/latest/mmu.html#how-to-select-heap)
 #warning then check http://<ip>/heap
 #endif // MMU_IRAM_HEAP
-#if !defined(DEBUG_ESP_OOM) && !defined(CORE_MOCK)
+#ifndef DEBUG_ESP_OOM
 #error on ESP8266 and ESPUI, you must define OOM debug option when developping
 #endif
 #endif
+#endif
 
 const char* ssid = "ESPUI";
 const char* password = "espui";
@@ -67,7 +69,7 @@ void buttonCallback(Control* sender, int type)
 void buttonExample(Control* sender, int type, void* param)
 {
     Serial.print("param: ");
-    Serial.println(long(param));
+    Serial.println((long)param);
     switch (type)
     {
     case B_DOWN:
diff --git a/library.json b/library.json
index 76d3173..2d40950 100644
--- a/library.json
+++ b/library.json
@@ -24,11 +24,6 @@
       "name": "ArduinoJson",
       "authors": "Benoit Blanchon",
       "frameworks": "arduino"
-    },
-    {
-      "name": "LittleFS_esp32",
-      "authors": "lorol",
-      "frameworks": "arduino"
     }
   ],
   "version": "2.2.3",