The following error is reporred by XST. Why?
"ERROR:HDLParsers:3010 - <file>.vhd Line xx. Entity %s does not exist."
This error appears when the entity specified in the configuration statement is not found.
Some of the reason why this error might occur are listed below:
1. Incorrect entity name is specified (due to a typographical mistake).
2. Entity that is being configured is not yet compiled.
configuration myconf of myentity is
-- rest of config stmt
Now, if "myentity" is either a typographical mistake or for some reason the file containing "myentity" is not yet compiled, you will receive this error.