Hi,

I have an app that is working fine locally. But when I run it through Heroku, I get the error in attachment. 

How can I fix this?

Thank you!

And here is my code in the init file

class quiz(Page):
    form_model = 'player'
    form_fields = ['quiz_answer']
    timeout_seconds = 30

    @staticmethod
    def vars_for_template(player: Player):
        participant = player.participant
        image = participant.images[player.round_number - 1]
        num = ""
        for c in image:
            if c.isdigit():
                num = num + c
        player.quiz_question = num
        return {'img_to_show': "{}".format(image)}

Check whether the file extension is .png or .PNG. Heroku servers are unix-based and therefore case sensitive.

Thanks Chris. Now, all my images are .png (and so it is specified in the file path), but I get the same error (see in attachment). Any other ideas for why this could be happening? Again, I have no issue locally on my computer. 


def creating_session(subsession: Subsession):
    PicturePool = [i.split("/")[-1] for i in glob('_static/questions/*png')]
    if subsession.round_number == 1:
        for p in subsession.get_players():
            selected_img = random.sample(PicturePool, k=30)
            PicturePool = [e for e in PicturePool if e not in selected_img]

            print('player', p.id_in_subsession)
            print(selected_img)
            print(len(PicturePool))

            p.participant.images = selected_img
            
            
class quiz(Page):
    form_model = 'player'
    form_fields = ['quiz_answer']
    timeout_seconds = 30

    @staticmethod
    def vars_for_template(player: Player):
        participant = player.participant
        image = participant.images[player.round_number - 1]
        num = ""
        for c in image:
            if c.isdigit():
                num = num + c
        player.quiz_question = num
        return {'img_to_show': "{}".format(image)}

Thanks Chris. Now, all my images are .png (and so it is specified in the file path), but I get the same error (see in attachment). Any other ideas for why this could be happening? Again, I have no issue locally on my computer. 


def creating_session(subsession: Subsession):
    PicturePool = [i.split("/")[-1] for i in glob('_static/questions/*png')]
    if subsession.round_number == 1:
        for p in subsession.get_players():
            selected_img = random.sample(PicturePool, k=30)
            PicturePool = [e for e in PicturePool if e not in selected_img]

            print('player', p.id_in_subsession)
            print(selected_img)
            print(len(PicturePool))

            p.participant.images = selected_img
            
            
class quiz(Page):
    form_model = 'player'
    form_fields = ['quiz_answer']
    timeout_seconds = 30

    @staticmethod
    def vars_for_template(player: Player):
        participant = player.participant
        image = participant.images[player.round_number - 1]
        num = ""
        for c in image:
            if c.isdigit():
                num = num + c
        player.quiz_question = num
        return {'img_to_show': "{}".format(image)}

Thanks Chris. Now, all my images are .png (and so it is specified in the file path), but I get the same error (see in attachment). Any other ideas for why this could be happening? Again, I have no issue locally on my computer. 


def creating_session(subsession: Subsession):
    PicturePool = [i.split("/")[-1] for i in glob('_static/questions/*png')]
    if subsession.round_number == 1:
        for p in subsession.get_players():
            selected_img = random.sample(PicturePool, k=30)
            PicturePool = [e for e in PicturePool if e not in selected_img]

            print('player', p.id_in_subsession)
            print(selected_img)
            print(len(PicturePool))

            p.participant.images = selected_img
            
            
class quiz(Page):
    form_model = 'player'
    form_fields = ['quiz_answer']
    timeout_seconds = 30

    @staticmethod
    def vars_for_template(player: Player):
        participant = player.participant
        image = participant.images[player.round_number - 1]
        num = ""
        for c in image:
            if c.isdigit():
                num = num + c
        player.quiz_question = num
        return {'img_to_show': "{}".format(image)}