When starting the xaml from command line, if use /i: instead of /input: to send input arguments, I get error

When starting the xaml from command line, if use /i: instead of /input: to send input arguments, I get error - Error converting value “{‘argument1’:‘value’}” to type ‘System.Collections.Generic.Dictionary`2[System.String,System.Object]’. Path ‘’, line 1, position 21.