while compiling my VHDL code i'm getting this error, please help me.

[Arrowspace]

ERROR:HDLParsers:3014 - "C:/xilinx project/Sequencial_filter/Sequencial_filter.vhd" Line 28. Library unit types is not available in library work.


while compiling my VHDL code i'm getting this error, please help me.

 

[barry]

Ok, we will just guess what's on line 28.

 

[Arrowspace]

ERROR:HDLParsers:3281 - "C:/xilinx project/Neetu/carryselectadder/carryselectadder/carryselectadder.vhd" Line 36. RTL is not an architecture body for ripple_carry4 in library work.


ERROR:HDLParsers:3281 - "C:/xilinx project/Neetu/carryselectadder/carryselectadder/carryselectadder.vhd" Line 37. RTL is not an architecture body for ripple_carry4 in library work.

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I am also looking for VHDL code.

carry select
carry skip
carry increment