C++ invalid conversion from 'const char*' to 'char' [duplicate] - c++

Question

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invalid conversion from ‘const char*’ to ‘char’
(2 answers)
Closed 6 years ago.
I'm new to Arduino and C++. I wanted to make a program which will read input from a serial port. However there seem to be some problems when I try to compile it.
The error message that I am receiving is:
invalid conversion from const char* to char
Here is my code:
#define nombreBouteille 10
#define nombreCocktail 8
String cocktail[nombreCocktail][nombreBouteille][2];
String bouteille[nombreBouteille];
int serialValue;
void loop() {
if (Serial.available() > 0)
int serialValue = Serial.read();
if (serialValue == '1') {
readBouteille();
readCocktail();
}
}
//Read and set the bottles content
void readBouteille() {
for( int i = 0; i < nombreBouteille; i++) {
bouteille[i] = Serial.readStringUntil(" ");
}
}
//Read the cocktail
void readCocktail() {
for( int i = 0; i < nombreCocktail; i++) {
for ( int j = 0; j < nombreBouteille; j++) {
cocktail[i][j][0] = Serial.readStringUntil(" ");
cocktail[i][j][1] = Serial.parseInt();
}
}
}

Answer 1

readStringUntil takes a single char parameter to specify a delimiter, not a C string (const char *). So change:
bouteille[i] = Serial.readStringUntil(" "); // wrong: " " is a `const char *`
to:
bouteille[i] = Serial.readStringUntil(' '); // right: ' ' is a `char`
and similarly for the other call to readStringUntil.