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I wrote a custom shipping module for Magento 2.0 that adds an LTL/Fright option. It worked in Magento 2.0.7, and I was recently testing 2.1.7. It appears all of my other (self authored) modules work, but my Shipping module does not.

After adding an item to the cart, and going to http://localhost/checkout/cart I get the following error:

Exception #0 (ReflectionException): Class ComstarTliModelCarrier does not exist

#0 D:WebhtmlvendormagentoframeworkCodeReaderClassReader.php(19): ReflectionClass->__construct('Comstar\Tli\Mod...')

#1 D:WebhtmlvendormagentoframeworkObjectManagerDefinitionRuntime.php(44): MagentoFrameworkCodeReaderClassReader->getConstructor('Comstar\Tli\Mod...')

#2 D:WebhtmlvendormagentoframeworkObjectManagerFactoryDynamicDeveloper.php(71): MagentoFrameworkObjectManagerDefinitionRuntime->getParameters('Comstar\Tli\Mod...')

#3 D:WebhtmlvendormagentoframeworkObjectManagerObjectManager.php(57): MagentoFrameworkObjectManagerFactoryDynamicDeveloper->create('Comstar\Tli\Mod...', Array)

#4 D:Webhtmlvendormagentomodule-shippingModelCarrierFactory.php(74): MagentoFrameworkObjectManagerObjectManager->create('Comstar\Tli\Mod...')

#5 D:Webhtmlvendormagentomodule-shippingModelConfig.php(65): MagentoShippingModelCarrierFactory->create('tli', NULL)

#6 D:Webhtmlvendormagentomodule-checkoutModelDefaultConfigProvider.php(590): MagentoShippingModelConfig->getActiveCarriers()

#7 D:Webhtmlvendormagentomodule-checkoutModelDefaultConfigProvider.php(292): MagentoCheckoutModelDefaultConfigProvider->getActiveCarriers()

#8 D:WebhtmlvendormagentoframeworkInterceptionInterceptor.php(146): MagentoCheckoutModelDefaultConfigProvider->getConfig()

#9 D:WebhtmlvargenerationMagentoCheckoutModelDefaultConfigProviderInterceptor.php(26): MagentoCheckoutModelDefaultConfigProviderInterceptor->___callPlugins('getConfig', Array, Array)

#10 D:Webhtmlvendormagentomodule-checkoutModelCompositeConfigProvider.php(32): MagentoCheckoutModelDefaultConfigProviderInterceptor->getConfig()

#11 D:Webhtmlvendormagentomodule-checkoutBlockCartShipping.php(54): MagentoCheckoutModelCompositeConfigProvider->getConfig()

#12 D:Webhtmlvendormagentomodule-checkoutviewfrontendtemplatescartshipping.phtml(28): MagentoCheckoutBlockCartShipping->getCheckoutConfig()

.... (stack trace continues to 95 lines)

app/code/Comstar/Tli/Model/Carrier.php

namespace ComstarTliModel;



[... class imports ...]



class Carrier extends AbstractCarrier implements CarrierInterface

{

    [... var declarations ...]



    public function __construct([... DI ...])

    {

        parent::__construct($scopeConfig, $errorFactory, $log, $data)

    }

}

app/code/Comstar/Tli/etc/config.xml

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Store:etc/config.xsd">

    <default>

        <carriers>

            <tli>

                <active>1</active>

                <sallowspecific>0</sallowspecific>

                <allowed_methods>AACR,AACT</allowed_methods>

                <model>ComstarTliModelCarrier</model>

                <type>LTL</type>

                <title>Freight</title>

                <name>Comstar LTL</name>

                <specificerrmsg>There are no LTL Quotes available for this shipment.</specificerrmsg>

                <min_package_weight>125</min_package_weight>

                <max_package_weight>10000</max_package_weight>

            </tli>

        </carriers>

    </default>

</config>

The Class ComstarTliModelCarrier clearly exists, and as I said, this module worked in 2.0.7. I did a quick review of Magento_Ups to see if anything major changed in the way shipping modules are loaded, but it doesn't appear to be built any differently.

I am running on WAMP 3.0.9, PHP 7.0.21. I updated from 2.0.7 to 2.1.7 by deleting the /vendor/ folder and copying all 2.1.7 files into the Magento 2 root.

Why isn't Magento 2.1 able to find my Class?

I my case,

I had actually a syntax error in the constructor. but it was not shown as usual errors with line number.
I ran,

php bin/magento setup:di:compile

It displayed there is syntax error and showed line number.
Then updgrade,

php bin/magento setup:upgrade

and deploy,

php bin/magento setup:static-content deploy

May be helpful.

Turns out on this particular file, I had opened with a <? tag instead of a <?php tag. I'm not sure if it was the newer version of WAMP or PHP that triggered that sensitivity, but using <?php fixed the problem!

You can try to use

setup:di:compile

command.

Also, try to remove var/cache/* var/page_cache/* var/generation/*

and run

setup:upgrade

command.

Below command works for me
In order to bypass "Allowed memory size of error" add memory_limit=-1 before the command.

php -d memory_limit=-1  bin/magento setup:di:compile