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kotlinlang

I’m getting this error in a new kotlin plug-in I’m developing (using BNF file). 
`warning: [options] bootstrap class path not set in conjunction with -source 1.6
/Users/ekendahl/Projects/edaphic/coder/src/main/gen/tech/edaphic/coder/systemverilog/lexer/SystemVerilogLexer.java:3478: error: invalid method declaration; return type required
  public _SystemVerilogLexer() {`
 anyone knows why? I’ve looked at the the rust plugin (the plugin I’m trying to mimic most) and they have very similar code and it works when building with them.