Could not adapt the given Sling Model from neither request nor resource

I am still facing this problem. I get the same stacktrace if I do that. In the code I pasted in the original message the SlingHTTPServletResponse was annotated with \@Self but it didn't show up in the code block for some reason.

Here is a link to that file in github where you can see the annotation https://github.com/lilt/aem-translation-framework-bootstrap-connector/blob/master/core/src/main/java/com/adobe/granite/translation/connector/bootstrap/ui/models/BootStrapTranslationConnectorModel.java

I've also tried using SlingObject instead of Self. The stacktrace is the same in all of these instances. The full stacktrace is posted in the original message.

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 */

package com.adobe.granite.translation.connector.bootstrap.ui.models;

import com.adobe.granite.translation.connector.bootstrap.core.BootstrapTranslationCloudConfig;
import com.day.cq.commons.jcr.JcrConstants;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceResolver;
import org.apache.sling.models.annotations.Model;
import org.apache.sling.models.annotations.injectorspecific.Self;
import org.apache.sling.models.annotations.injectorspecific.SlingObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.PostConstruct;

/*
 *  Sling Model used in editform.html sightly file for fetching the bootstrap cloud config input fields for populating the form
 *  For more info about Sling Model refer https://sling.apache.org/documentation/bundles/models.html#osgi-service-filters
 */

@Model(adaptables = SlingHttpServletRequest.class)
public class BootStrapTranslationConnectorModel {

    private static final Logger logger = LoggerFactory.getLogger(BootStrapTranslationConnectorModel.class);

    @SlingObject
    private SlingHttpServletRequest request;

    @SlingObject
    private ResourceResolver resourceResolver;
    private String bootStrapConfigPath;
    private Resource bootStrapConfigResource;

    @PostConstruct
    public void postConstruct() throws Exception {
        bootStrapConfigPath = request.getRequestPathInfo().getSuffix();
        resourceResolver = request.getResourceResolver();
        bootStrapConfigResource = resourceResolver.getResource(bootStrapConfigPath);
    }

    /*
     *  Get the server url for the configuration
     */
    public String getServerUrl() {
        return BootStrapModelUtils.getStringPropertyFromContent(bootStrapConfigResource, BootstrapTranslationCloudConfig.PROPERTY_DUMMY_SERVER_URL, logger);
    }

    public String getServiceId() {
        return BootStrapModelUtils.getStringPropertyFromContent(bootStrapConfigResource, BootstrapTranslationCloudConfig.PROPERTY_DUMMY_CONFIG_ID, logger);
    }

    public String getPreviewDirectory() {
        return BootStrapModelUtils.getStringPropertyFromContent(bootStrapConfigResource, BootstrapTranslationCloudConfig.PROPERTY_PREVIEW_PATH, logger);
    }

    /*
     *  form action attribute (post path where the configuration input values would be saved), jcr:content node of the configuration for bootstrap
     */
    public String getFormPostPath() {
        return bootStrapConfigPath + '/' + JcrConstants.JCR_CONTENT;
    }

}