Newbie needs help

Trying to upload sketch to Feather Huzzar but get this error,

Arduino: 1.8.8 (Windows 7), Board: "Adafruit Feather HUZZAH ESP8266, 80 MHz, Flash, Disabled, 4M (no SPIFFS), v2 Lower Memory, Disabled, None, Only Sketch, 9600"

Sketch uses 299088 bytes (28%) of program storage space. Maximum is 1044464 bytes.
Global variables use 40284 bytes (49%) of dynamic memory, leaving 41636 bytes for local variables. Maximum is 81920 bytes.
C:\Users\Neil\AppData\Local\Arduino15\packages\esp8266\tools\esptool\2.5.0-3-20ed2b9/esptool.exe -vv -cd nodemcu -cb 9600 -cp COM5 -ca 0x00000 -cf C:\Users\Neil\AppData\Local\Temp\arduino_build_780494/wemos.ino.bin 
esptool v0.4.13-1-gf80ae31 - (c) 2014 Ch. Klippel <ck@atelier-klippel.de>
	setting board to nodemcu
	setting baudrate from 115200 to 9600
	setting port from COM1 to COM5
	setting address from 0x00000000 to 0x00000000
	espcomm_upload_file
	espcomm_upload_mem
	setting serial port timeouts to 1000 ms
opening bootloader
resetting board
trying to connect
	flush start
	setting serial port timeouts to 1 ms
	setting serial port timeouts to 1000 ms
	flush complete
	espcomm_send_command: sending command header
	espcomm_send_command: sending command payload
	read 0, requested 1
trying to connect
	flush start
	setting serial port timeouts to 1 ms
	setting serial port timeouts to 1000 ms
	flush complete
	espcomm_send_command: sending command header
	espcomm_send_command: sending command payload
	espcomm_send_command: receiving 2 bytes of data
	espcomm_send_command: receiving 2 bytes of data
	espcomm_send_command: receiving 2 bytes of data
	espcomm_send_command: receiving 2 bytes of data
	espcomm_send_command: receiving 2 bytes of data
	espcomm_send_command: receiving 2 bytes of data
	espcomm_send_command: receiving 2 bytes of data
	espcomm_send_command: receiving 2 bytes of data
Uploading 303232 bytes from C:\Users\Neil\AppData\Local\Temp\arduino_build_780494/wemos.ino.bin to flash at 0x00000000
	erasing flash
	size: 04a080 address: 000000
	first_sector_index: 0
	total_sector_count: 75
	head_sector_count: 16
	adjusted_sector_count: 59
	erase_size: 03b000
	espcomm_send_command: sending command header
	espcomm_send_command: sending command payload
	setting serial port timeouts to 15000 ms
	setting serial port timeouts to 1000 ms
	espcomm_send_command: receiving 2 bytes of data
	writing flash
................................................................................ [ 26% ]
................................................................................ [ 53% ]
................................................................................ [ 80% ]
.....................An error occurred while uploading the sketch

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

Also when trying to upload the led on the board flashes very slow at about a second or so & takes a minute or 2 to finish.

Nige.

My mistake?
I had already loaded a sketch to that board but wanted some changes to it.

I thought that someone might have been able to tell me what the error meant?

Also i should have said that i have tried 3 different boards & different sketches & NOW none will load?

I thought that i would delete Arduino & start again but when i did everything was the same,
so i think it must have left some things somewhere.

Just a note to say thanks to all the people that helped.
I finally got it going,,,,had to find every bit of Arduino & delete it.
Then reloaded it & everything is ok.