Error - unexpected TICK

[MikeChorobik]

can someone help me to fix this error?
i have no idea what it means!

the error occurs on the first line of the following code...i don't understand what the problem is.

when Read => Data <= 'ADC';
if ADCbusy ='0' then
next_state <= Read;
elsif ADCbusy ='1' then
next_state <= Write;
end if;

thanx

-- Mike --

 

[Magneto71]

You are assigning ADC to Data, so assuming that they are of the same type you should write.
when Read => Data <= ADC;

Ticks are used for properties such as
when Read => Data <= ADC(Data'range);
if Data and ADC are of different width for instance.