No variable, parameter, or equation definition - error M

When a variable, parameter, or equation is used which has not been declared one gets error $140. The example shorterr17.gms illustrates such errors under the use of the errmsg=1 option which repositions the error message explanatory text.

  20  POSITIVE VARIABLES PRODUCTION(PROCESS) ITEMS PRODUCED BY PROCESS;

  21  VARIABLES          PROFIT              TOTALPROFIT;

  22  EQUATIONS          OBJT OBJECTIVE FUNCTION ( PROFIT )

  23  ;

  24  OBJT.. PROFIT=E=   SUM(PROCESS,(PRICE(PROCESS)*yield(process)

  25                             -PRODCOST(PROCESS))*PRODUCTION(PROCESS)) ;

  26  AVAILABLE(RESOURCE).. SUM(PROCESS,RESOURUSE(RESOURCE,PROCESS)

****          $140

**** 140  Unknown symbol

  27                       *PRODUCTION(PROCESS))  =L= RESORAVAIL(RESOURCE);

  28  MODEL RESALLOC /ALL/;