INCL_ILLEGAL_CODE is an ABAP runtime error which you may come across when using or developing within an SAP system. See below for the standard details explaining what it means and how you can avoid or fix this runtime error.
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You can view further information about a runtme error by using transaction code ST22 which will show you this and all runtime erros that have happen in your SAP system.
Also check out the Comments section below to view or add related contributions and example screen shots.
Regenerate the program <runtime parameter>.
Please see internal error for more details about the possible cause of this runtime error and how it could be avoided.
At runtime, ABAP/4 does not process the program source code itself,
but intermediate code created from the source code when you generate the
program.
The intermediate code for the current program <runtime parameter> is in a format unknown to ABAP/4 at runtime.
This error can occur, for example, if you are using different versions
of the R/3 system to access one database.
Please see internal error for more details about the possible cause of this runtime error and how it could be avoided.