Facing prob with corrplot

Hi Frnds..am learning R ..
I want plot correlation by using corrplot .but is showing error that columns must be numeric..(my dataset consist float datatype columns)

am trying to change column datatypes...but its showing error like this

Error in $<-.data.frame(*tmp*, zn, value = numeric(0)) : replacement has 0 rows, data has 506

plz any one suggest the solution...

HERE ZN is Column Name


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