Image wont convert form greyscale to duotone

[Al Twisted]

I am desiging labels for a vinyl record.

I had a rough deisgn to i converted ot greyscale but then no option for dutone was available.

So I made a new greyscale file...import the layers i want into a new psd file made to be the right size i require.

then convert to greyscale and save

but i still have no option to make duotone...

With other files not included the layeres i have imported in it works but not with these

any ideas??

 

[Al Twisted]

ok sorted. its coz it was 16bit rather than 8bit