Multiple Excel worksheets: unknown identifier & ExcelSheet

[Firas]

this is the error message
Error (RT) in AddNewEmployee: 0x8002801D, Library not registered.

typelib Excel {00020813-0000-0000-C000-000000000046} 1.7
ExcelSheet es.Init

with dotted red line under es.Init

I inserted this line
typelib Excel {00020813-0000-0000-C000-000000000046} 1.7
in my macro just above ExcelSheet es.Init.
color of Excel word is grayed out.