I have CASIO SE -5300 and cannot sign in with correct ID number shows error E008

You should have been given a secret PIN number by your manager to log on to the machine. It won't allow sales without a sign on because it can't be traced to an operator. If you have forgotten the PIN number, you can program a new one. One of the users has a manual here:
https://the-checkout-tech.com/manuals/cashregisters/Casio_SE-C450_user_and_programming_manual.html

Cindy
is this a casio qt 6000 cash register ?
if so it has a clk1 clk2 clk3 clk4 clk5 clk 6 screen icons on the left of screen just outside your attached photo
I think you need to sign out one of these clerk numbers before you can sign in.
the clerk number is on the receipt when it prints out
http://totalpos.co.nz/wp-content/uploads/2012/10/Casio-QT6000.pdf
page 23 shows how to sign out clerk.

Hi. You just type in your clerk id number and press the CLK# (clerk) button. That will remove the error and allow use of the register. If you've forgotten your secret ID code, you can program a new one. One of the users has most manuals here:
https://the-checkout-tech.com/

That surgest you have no clerk numbers yet as the error E008 = Not signed on, working without a clerk number i have uploaded a manual for this on my host HERE i hope this helps

You will need to enter the clerk password then press clerk button to sign on

This is correct. You have to be signed on to the machine to perform any tasks. this is because the machine keeps a record of who performed any functions. Just sign on to enter programming

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If anyone needs more information, the Casio PCRT470 user and programming manual is here:

http://the-checkout-tech.com/manuals/cashregisters/Casio_PCR-T470_users_and_programming_manual.html

I've run the cash register and then appeared on the screen error e004 ,i am repair the error , and then appeared on the screen error e008, and now I do not know what to do , also i dont know the clerk number please help me

It sounds like you haven't logged on. Type your PIN number and press CLK# button. If you haven't set a PIN number, the default one will be 1

You need to log on to the register. Try 1 CLK#
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If anyone needs more information, the Casio SE manuals are here:
SE-S10 Operation and programming manual http://the-checkout-tech.com/manuals/cashregisters/Casio_SE-S10_user_manual.html
SE-S10 Service (repair) manual http://the-checkout-tech.com/manuals/cashregisters/Casio_SE-S10_PCR-T280_PCR-T280L_PCR-T290L_service_manual.html
SE-C300, SE-C2000, SE-S300, SE-S2000 dealer programming manual http://the-checkout-tech.com/manuals/cashregisters/Casio_SE-C300_SE-C2000_and_SE-S300_SE-S2000_dealers_manual.html
SE-S6000, SE-C6000 dealer programming manual http://the-checkout-tech.com/manuals/cashregisters/Casio_SE-S6000_SE-C6000_dealer_CA_Ver_manual.html
SE-S6000, SE-C6000 Service (repair) manual http://the-checkout-tech.com/manuals/cashregisters/Casio_SE-S6000_SE-C6000_service_manual.html

You need a expert. Thank you.