Latex multiply defined

The log message you quoted is a sort of "summary" of earlier, more detailed warnings, telling you exactly which references are undefined/multiply defined.

There were multiply-defined labels. This error is related to cross-referencing. It appears when you use the same label multiple times for different objects, causing .

You are using the texreg package to create multiple tables for inclusion in a LaTeX document. When you use the texreg function, a LaTeX table.