Getting unresolved external symbol error during creation of dll file

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Hello,

I am getting 'unresolved external symbol error' while compiling and creating dll file from Fotran code.

To get line status, I am using the API:

CALL BRNINT(ICON(M),ICON(M+1),ICON(M+2),'STATUS', STATUS, IERR)

With ICON(M+2), I am getting the external symbol error. However, if I replace ICON(M+2) with '1', I get no error.

CALL BRNINT(ICON(M),ICON(M+1),'1','STATUS', STATUS, IERR)

Is it possible that the ICON(M+2) is being considered any other type other than type CHARACTER? Is there a way to fix the issue?

Thank you.