"fmt" imported and not used

"github.com/0chain/gosdk/core/encryption" imported and not used

declared and not used: round

undefined: payload

cannot use fs (variable of type *MockFileStore) as filestore.FileStorer value in argument to filestore.SetFileStore: *MockFileStore does not implement filestore.FileStorer (missing method CopyFile)

assignment mismatch: 2 variables but change.ApplyChange returns 1 value

too many arguments in call to change.ApplyChange

cannot use fs (variable of type *MockFileStore) as filestore.FileStorer value in argument to filestore.SetFileStore: *MockFileStore does not implement filestore.FileStorer (missing method CopyFile)

assignment mismatch: 2 variables but change.ApplyChange returns 1 value