Unity iOS App quitting from Xcode because of Unloading x unused Assets to reduce memory.

Unity iOS App quitting from Xcode because of Unloading x unused Assets to reduce memory. . Please guide me how to avoid this crash so that i can fix my other memory related issues. Below sample debug log. Unloading 4 Unused Serialized files (Serialized files now loaded: 9 / Dirty serialized files: 0)

Unloading 205 unused Assets to reduce memory usage. Loaded Objects now: 8951. Total: 461.658386 ms (FindLiveObjects: 3.538875 ms CreateObjectMapping: 0.739375 ms MarkObjects: 446.749847 ms DeleteObjects: 9.979416 ms)

Thanks in advance...