error installing marshmallow on sony xperia c3 dual. rooted, Cwm installed

these errors will displayed on flashtool
can any body help me on this??
7/014/2016 12:14:42 - INFO - Device connected in flash mode
17/014/2016 12:14:42 - INFO - Opening device for R/W
17/014/2016 12:14:43 - INFO - Reading device information
17/014/2016 12:14:43 - INFO - Phone ready for flashmode operations.
17/014/2016 12:14:43 - INFO - Current device : D2502 - YT91155AV2 - 1289-0595_R3B - 1286-5872_19.2.2.B.0.78 - GLOBAL-HSPA_19.2.1.A.0.72
17/014/2016 12:14:43 - INFO - Start Flashing
17/014/2016 12:14:43 - INFO - Processing loader.sin
17/014/2016 12:14:43 - INFO - Checking header
17/014/2016 12:14:43 - ERROR - Processing of loader.sin finished with errors.
17/014/2016 12:14:43 - INFO - Ending flash session
17/014/2016 12:14:43 - ERROR - ERR_SEVERITY="MINOR";ERR_CODE="0017";ERR_DYNAMIC=" 800A0017";

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Please help me. I messed up and my phone has no OS installed. Won't boot past google.

So I rooted my phone and I messed up with some layers. I have TWRP installed and was on 6.1 I accidently messed up and formated my whole phone including the os. I have Nexus6P_6.0.0_MBD08K ((Stock image)) downloaded and saved on my computer. But I have no idea what to do with it. Someone please help me out. I'll give you my google play music card if you can get my phone to work. :crying::confused:

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