This indicates the OBB file is missing or incorrectly named. Recheck that the folder path is exactly Android/obb/com.gameloft.android.ANMP.GloftM4HM/ and that the main OBB file inside matches the version of your APK.
The Ultimate Guide to Modern Combat 4 APK + OBB Offline Fixed: Play Anywhere, Anytime modern combat 4 apk obb offline fixed