Packaged assetbundle randomly lost some asset

I got a problem about webplayer assetbundle in Unity 3.5.0 or 3.5.1.

Our game just packaged some fx prefabs into a assetbule by unityEditor interface BuildAssetBundleExplicitAssetNames() under CollectDependencies mode.

And then I found one or two assets in package can not be found when try to load them using WWW.assetBundle.Load().

Every time I repackaged the assetbundle, different asset lost randomly.

Here is an example: In fxpackage_19 can not find asset hit_01_03

-Package Download URL: http://www.filedropper.com/fxpackage19

-And I got the package log as following(BTW: I found there is a blank line " 3.5 kb 0.5% _____________", who knows why?):

Updating ProjectSettings/ProjectSettings.asset - GUID: 00000000000000004000000000000000...
 done. [Time: 21.278651 ms]
----- Total AssetImport time: 0.106631s, Asset Import only: 0.046753s, CacheServerIntegrate only: 0.000000s, CacheMove: 0.000000s, CacheDelete: 0.000000s, CacheServer Download: 3.867734s [Unknown, 3656594751488.000000 mb/s], CacheServer Hashing: 3.867734s [Unknown, 3656594751488.000000 mb/s]
Textures      552.6 kb	 87.0% 
Meshes        13.4 kb	 2.1% 
Animations    6.1 kb	 1.0% 
Sounds        0.0 kb	 0.0% 
Shaders       0.0 kb	 0.0% 
Other Assets  26.8 kb	 4.2% 
Levels        0.0 kb	 0.0% 
Scripts       0.0 kb	 0.0% 
Included DLLs 0.0 kb	 0.0% 
File headers  36.1 kb	 5.7% 
Complete size 635.0 kb	 100.0% 
Used Assets, sorted by uncompressed size:
 341.4 kb	 53.8% Assets/Arts/Particle/ParticleTexture/blood_ifl_rno_00_00.png
 42.8 kb	 6.7% Assets/Arts/Particle/ParticleTexture/thunder_runno_ifl001_00.png
 21.4 kb	 3.4% Assets/Arts/Particle/ParticleTexture/wave_rno_01_00.png
 10.8 kb	 1.7% Assets/Arts/Particle/ParticleTexture/fog_runno_ifl002_00.png
 10.8 kb	 1.7% Assets/Arts/Particle/ParticleTexture/fire_runno_ifl000_00.png
 10.8 kb	 1.7% Assets/Arts/Particle/ParticleTexture/lightover_runno_42_00.png
 10.8 kb	 1.7% Assets/Arts/Particle/ParticleTexture/particle_runno_ifl02_00.png
 10.8 kb	 1.7% Assets/Arts/Particle/ParticleTexture/thunder_ifl004_00.png
 8.1 kb	 1.3% Assets/Arts/Meshes/FXMesh/Other/sanchaji_00.FBX
 5.4 kb	 0.9% Assets/Arts/Particle/ParticleTexture/lightover_runno_27_00.png
 5.4 kb	 0.9% Assets/Arts/Particle/ParticleTexture/lightover_runno_12_01.png
 5.4 kb	 0.9% Assets/Arts/Particle/ParticleTexture/particle_runno_11_00.png
 5.4 kb	 0.9% Assets/Arts/Particle/ParticleTexture/particle_runno_03_01.png
 5.4 kb	 0.9% Assets/Arts/Particle/ParticleTexture/gound_runno_04_00.png
 5.4 kb	 0.9% Assets/Arts/Particle/ParticleTexture/snow_runno_00_00.png
 5.4 kb	 0.9% Assets/Arts/Particle/ParticleTexture/sign_runno_20_00.png
 5.4 kb	 0.9% Assets/Arts/Particle/ParticleTexture/ring_runno_12_00.png
 5.4 kb	 0.9% Assets/Arts/Particle/ParticleTexture/fog_runno_05_00.png
 5.4 kb	 0.9% Assets/Arts/Particle/ParticleTexture/fog_runno_04_00.png
 5.4 kb	 0.9% Assets/Arts/Particle/ParticleTexture/sanchaji_00_02.png
 5.4 kb	 0.9% Assets/Arts/Particle/ParticleTexture/sanchaji_00_01.png
 5.3 kb	 0.8% Assets/Arts/Meshes/FXMesh/Other/ring_runno_02.FBX
 3.5 kb	 0.5% 
 2.8 kb	 0.4% Assets/Arts/Particle/ParticleTexture/ring_runno_02_00.png
 2.8 kb	 0.4% Assets/Arts/Particle/ParticleTexture/lightover_runno_03_00.png
 2.8 kb	 0.4% Assets/Arts/Particle/ParticleTexture/lightover_runno_02_00.png
 2.8 kb	 0.4% Assets/Arts/Particle/ParticleTexture/particle_runno_15_00.png
 2.8 kb	 0.4% Assets/Arts/Particle/ParticleTexture/particle_runno_06_01.png
 2.8 kb	 0.4% Assets/Arts/Particle/ParticleTexture/tarl_runno_01_00.png
 2.8 kb	 0.4% Assets/Arts/Particle/ParticleTexture/sign_runno_20_01.png
 2.8 kb	 0.4% Assets/Arts/Particle/ParticleTexture/chop_runno_07_00.png
 2.7 kb	 0.4% Assets/Arts/Particle/ParticleTexture/light_20.png
 2.3 kb	 0.4% Assets/Arts/Particle/ParticleSystem/skill_HHBZ_hszn_hit1.prefab
 2.1 kb	 0.3% Assets/Arts/Particle/ParticleSystem/skill_CYNW_dyh_cast1.prefab
 1.9 kb	 0.3% Assets/Arts/Particle/ParticleSystem/skill_78_hero_cast1.prefab
 1.6 kb	 0.3% Assets/Arts/Particle/ParticleSystem/skill_BKGZ_hzdg_cast1.prefab
 1.6 kb	 0.2% Assets/Arts/Particle/particleAct/skill_cynw_dyh_c1_g1.anim
 1.5 kb	 0.2% Assets/Arts/Particle/particleAct/skill_bkgz_hzdg_c1_g.anim
 1.5 kb	 0.2% Assets/Arts/Particle/ParticleSystem/skill_HHBZ_hszn_hit3.prefab
 1.4 kb	 0.2% Assets/Arts/Particle/ParticleSystem/skill_BKGZ_hzdg_cast2.prefab
 1.4 kb	 0.2% Assets/Arts/Particle/ParticleTexture/lightover_runno_05_00.png
 1.4 kb	 0.2% Assets/Arts/Particle/ParticleTexture/sanchaji_00_00.png
 1.0 kb	 0.2% Assets/Arts/Particle/ParticleSystem/skill_BB_hazw_aylj_hit2.prefab
 1.0 kb	 0.2% Assets/Arts/Particle/ParticleSystem/hit_01_03.prefab
 1.0 kb	 0.2% Assets/Arts/Particle/particleAct/skill_fkyj_klsg_frly_c2_g.anim
 0.9 kb	 0.1% Assets/Arts/Particle/ParticleSystem/skill_FKYJ_klsg_frly_cast0.prefab
 0.9 kb	 0.1% Assets/Arts/Particle/particleAct/skill_fkyj_klsg_c0_ring.anim
 0.8 kb	 0.1% Assets/Arts/Particle/particleAct/skill_hhbz_hszn_h1.anim
 0.8 kb	 0.1% Assets/Arts/Particle/ParticleSystem/skill_BB_hazw_aylj_cast1.prefab
 0.8 kb	 0.1% Assets/Arts/Particle/ParticleSystem/skill_BB_hazw_aylj_cast0.prefab
 0.6 kb	 0.1% Assets/Arts/Particle/ParticleSystem/skill_FKYJ_klsg_frly_cast1.prefab
 0.6 kb	 0.1% Assets/Arts/Particle/ParticleSystem/skill_BB_hazw_aylj_hit1.prefab
 0.6 kb	 0.1% Assets/Arts/Particle/ParticleSystem/skill_FKYJ_klsg_frly_cast3.prefab
 0.6 kb	 0.1% Assets/Arts/Particle/ParticleSystem/skill_HHBZ_hszn_hit2.prefab
 0.5 kb	 0.1% Assets/Arts/Particle/ParticleSystem/skill_FKYJ_klsg_frly_cast2.prefab
 0.2 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/lightover_runno_05_16.mat
 0.2 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/lightover_runno_05_28.mat
 0.2 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/sanchaji_00_01.mat
 0.2 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/sanchaji_00_00.mat
 0.2 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/wave_rno_01_01.mat
 0.2 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/wave_rno_01_00.mat
 0.2 kb	 0.0% Assets/Arts/Particle/particleAct/skill_FKYJ_klsg_frly_c1_0.anim
 0.2 kb	 0.0% Assets/Arts/Particle/particleAct/skill_bb_hazw_aylj_c0g.anim
 0.2 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/lightover_runno_42_04.mat
 0.2 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/lightover_runno_27_14.mat
 0.2 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/lightover_runno_27_06.mat
 0.2 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/lightover_runno_12_06.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/ring_runno_02_01.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/fog_runno_05_01.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/light_20.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/particle_runno_ifl02_00.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/lightover_runno_03_01.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/thunder_ifl004_00.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/particle_runno_15_02.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/particle_runno_15_00.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/particle_runno_11_05.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/particle_runno_06_02.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/particle_runno_03_18.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/lightover_runno_02_0.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/gound_runno_04_02.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/fog_runno_ifl002_06.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/fire_runno_ifl000_05.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/blood_ifl_rno_00_02.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/tarl_runno_01_03.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/snow_runno_00_04.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/sign_runno_20_01.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/sign_runno_20_00.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/sanchaji_00_02.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/ring_runno_12_04.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/fog_runno_04_11.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/fog_runno_04_10.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/chop_runno_07_08.mat
 0.1 kb	 0.0% Assets/Arts/Particle/ParticleTexture/Materials/thunder_runno_ifl001_00.mat
***Player size statistics***
Level 0 'assetbundles/fx/fxpackage_19.assetfxpack' uses 156.9 KB compressed / 0.6 MB uncompressed.
Total compressed size 156.9 KB. Total uncompressed size 0.6 MB.
Refresh, detecting if any assets need to be imported or removed ... 0.911981 seconds (Nothing changed)
*** Completed 'Build.WebAssetBundle.WebPlayer' in 2 seconds

I’m sorry. It’s a mistake. Our package tool has a bug : another package over write the origin one