My HTC desire 826 shows htc logo and fades to black screen and doesnot responds.

[AC Question]

While turinng on My HTC 826. it shows HTC logo and fades to black screen. Then nothing comes up No responds at all. I have to pull out battery to get restart. On recovery mode it shows

E:missing bitmap oem_unlock_bg
(Code -1)
E:missing bitmap oem_unlock_bg_yes
(Code -1)
E:missing bitmap oem_unlock_bg_no
(Code -1)
handle_cota_intsall: install cwpkg to /cota/cwpkg.zip
handle_cota_intsall: install cwpkg to /cota/cw.zip
Write host_mode success
E:failed to mount/data (Invalid argument).. try emmc mount
handle_cota_intsall: No CW files. Skip CW installation.
E:mount /cache fail, format it and mount again
E:failed to mount /cache (Invalid argument).. try emmc mount
E:Can't find device node for mount point /cache
E:find no more PARTITION: for package path /sdcard/ptt.zip
E:unknown volume for path[]
E:can't mount
E:failed to open last_install: Invalid argument.
E:mount /cache fail, format it and mount again
E:failed to open /cache(Invalid argument).. try emmc mount
E:Can't find device node for mount point /cache
E:failed to mount /cache
E:failed to set up expected mounts for install; aborting

I could not understand this. Could anyone help.
Thank You In advance/