School Catalogue - [Step 19 ] class SchoolCatalog and push() of undefined error

[https://www.codecademy.com/courses/learn-intermediate-javascript/projects/school-catalog

Hello, Apoliges if this has been covered before.
I’m learning JS and can’t seem to complete the optional step 19 of the above classes course.

I did the exact same as i did in the previous assignment related to building a Media Catalog, but this time I’m getting an error.
TypeError: Cannot read property ‘push’ of undefined

Summary
/home/ccuser/workspace/learn-javascript-classes-school-catalog/app.js:16
    this.schools.push(value);
                ^

TypeError: Cannot read property 'push' of undefined
    at SchoolCatalog.addSchool (/home/ccuser/workspace/learn-javascript-classes-school-catalog/app.js:16:17)
    at Object.<anonymous> (/home/ccuser/workspace/learn-javascript-classes-school-catalog/app.js:93:22)
    at Module._compile (module.js:571:32)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)
    at tryModuleLoad (module.js:447:12)
    at Function.Module._load (module.js:439:3)
    at Module.runMain (module.js:605:10)
    at run (bootstrap_node.js:427:7)
    at startup (bootstrap_node.js:151:9)
class SchoolCatalog { contructor(level) { this._level = level; this._schools = []; } get level() { return this._level; } get schools() { return this._schools; } addSchool(value) { this.schools.push(value); } } class School { constructor(name, level, numberOfStudents) { this._name = name; this._level = level; this._numberOfStudents = numberOfStudents; } get name() { return this._name; } get level() { return this._level; } get numberOfStudents() { return this._numberOfStudents; } set numberOfStudents(value) { if (typeof value === "number") { this._numberOfStudents = value; } console.log("Invalid input: numberOfStudents must be set to a Number."); } quickFacts() { console.log( `$(this._name) educates $(this._numberOfStudents) students at the $(this._level) level.` ); } static pickSubstituteTeacher(substituteTeachers) { let randInt = Math.floor(Math.random() * substituteTeachers.length); return substituteTeachers[randInt]; } } class PrimarySchool extends School { constructor(name, numberOfStudents, pickupPolicy) { super(name, "primary", numberOfStudents); this._pickupPolicy = pickupPolicy; } get pickupPolify() { return this._pickupPolicy; } } class MiddleSchool extends School { constructor(name, numberOfStudents) { super(name, "middle", numberOfStudents); } } class HighSchool extends School { constructor(name, numberOfStudents, sportsTeams) { super(name, "high", numberOfStudents); this._sportsTeams = sportsTeams; } get sportsTeams() { return this._sportsTeams; } } const lorraineHansbury = new PrimarySchool( "Lorraine Hansbury", 514, "Students must be picked up by a parent, guardian, or a family member over the age of 13." ); lorraineHansbury.quickFacts(); const sub = School.pickSubstituteTeacher([ "Jamal Crawford", "Lou Williams", "J. R. Smith", "James Harden", "Jason Terry", "Manu Ginobli", ]); console.log(sub); const alSmith = new HighSchool("Al E. Smith", 415, [ "Baseball", "Basketball", "Volleyball", "Track and Field", ]); console.log(alSmith.sportsTeams); const primarySchoolCatalog = new SchoolCatalog("Primary Schools"); primarySchoolCatalog.addSchool(lorraineHansbury); const highSchoolCatalog = new SchoolCatalog("High Schools"); highSchoolCatalog.addSchool(alSmith);

I’m sure I’m missing something plainly obvious but I’ve been stuck on this for half a day.

Hey,
just check the spelling of the constructor. Everything else ist fine.

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How embarrassing, clearly spelling is not my thing.

Thank you so, so much.

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