error using colon and real scalars

Hi , I wanna run my .m file that should have a variable called 'radius' but i got an error about "real scalars" please help me how can i solve it,

thanks for devote your time for me

[James Tursa]

Please post the entire error message for us to see, including the offending line of code.

[mohamad almasi]

hi james, thanks a lot for your attention to me, but fortunately I can solve it with defined a variable just for radius with limited specific boundaries,

thanks for devote your time for me

[José-Luis]

You still have not shown the code generating the error. Trying to help you given those conditions is like trying to sink a free throw while blindfolded and standing on rotating platform.