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WebPACK XST - ERROR :(VHP_0808): + cannot have such operands in this context.
While synthesizing VHDL designs in WebPACK, the following error messages occur:
ERROR : (VHP__0808). C:\Project\test.vhd Line 115. + can not have such operands in this context
EXEWRAP detected a return code of '1' from program 'xst'
EXEWRAP complete - 0 errors, 0 warnings.
Done: failed with exit code: 0001.
If the VHDL code is using any arithmetic operands, include arithmetic unsigned
or signed IEEE packages in the code.
In VHDL code, add either of these packages, depending on the sign convention
of the design: