compile error

[xiedeacc]

gcc 9.3
/home/tiger/src/software/clSPARSE/src/library/io/mm-reader.cpp:123:16: error: invalid conversion from ‘char*’ to ‘char’ [-fpermissive]
123 | return Typecode;
| ^~~~~~~~
| |
| char*
/home/tiger/src/software/clSPARSE/src/library/io/mm-reader.cpp:123:16: error: cannot bind rvalue ‘(char)((char*)(&((MatrixMarketReader*)this)->MatrixMarketReader::Typecode))’ to ‘char&’