First input must be a file name or a file identifier. File identifier must be an integer-valued scalar of type double. Invalid encoding. The file mode for fopen can not contain modes other than r, w, a, +, b, A, W or t. The file mode for fopen must contain exactly one of the modes ''r'', ''w'' or ''a''. The file mode for fopen may contain only one of the modifiers ''b'' or ''t''. The file name contains characters that are not contained in the filesystem encoding.\n Certain operations may not work as expected. Unable to find file. Ensure file exists and path is valid. Data size too large for reading. The maximum allowed size is 2^29 bytes. fseek and frewind are not supported operations when writing to an HDFS location.