I have been trying to reshape my data from wide to long

This is an example of how it looks like:

IdentifierRIC Cash0 Cash1 Cash2 Assets0 Assets1 Assets2 id
AGRO.BA 999 8888 999 000 999 1336661 1
ALUA.BA 7007 77042 5827 7376 6368 5510 2
AUSO.BA 3498616.1 7850334.5 3237908.4 5679970.5 3
BIOX.BA 2119 1256700 58430 2249700 18160 4
BOLT.BA 81237.113 98389.677 55871.863 70212.498 75644 5


I am using:
reshape long id Cash Assets, i(Cash Assets) j(year)


but I keep on getting:
Cash variable not found.

Please help. Thank you.