Ruby and Swig: TypeError: can't convert nil into String

Ruby and Swig: TypeError: can't convert nil into String

References

Reference NO 1

http://stackoverflow.com/questions/15197131/ruby-and-swig-typeerror-cant-convert-nil-into-string

Reference NO 2

http://stackoverflow.com/questions/13306003/cant-convert-stringio-into-string-typeerror-in-ruby

Reference NO 3

http://stackoverflow.com/questions/15073590/ruby-pack-typeerror-cant-convert-string-into-integer

Reference NO 4

http://stackoverflow.com/questions/12006955/cant-convert-fixnum-into-string-typeerror

Reference NO 5

http://stackoverflow.com/questions/8237311/why-does-this-ruby-case-statement-return-cant-convert-nil-into-string-typeerr

Reference NO 6

#EANF#

Reference NO 7

#EANF#

Reference NO 8

#EANF#