Data flow - Could not load resource. Please ensure no mistakes in the JSON and that referenced resources exist.

Question

The JSON file which was working fine for creating a Data flow is not working now. It throws the error,
"Could not load resource. Please ensure no mistakes in the JSON and that referenced resources exist." on clicking OK to create the Data Flow.

{
    "name": "user_profiles_to_datalake",
    "properties": {
        "type": "MappingDataFlow",
        "typeProperties": {
            "sources": [
                {
                    "dataset": {
                        "referenceName": "asal400_ecommerce_userprofiles_source",
                        "type": "DatasetReference"
                    },
                    "name": "EcommerceUserProfiles"
                },
                {
                    "dataset": {
                        "referenceName": "asal400_customerprofile_cosmosdb",
                        "type": "DatasetReference"
                    },
                    "name": "UserProfiles"
                }
            ],
            "sinks": [
                {
                    "linkedService": {
                        "referenceName": "asadatalakeSUFFIX",
                        "type": "LinkedServiceReference"
                    },
                    "name": "DataLake"
                }
            ],
            "transformations": [
                {
                    "name": "userId"
                },
                {
                    "name": "UserTopProducts"
                },
                {
                    "name": "DerivedProductColumns"
                },
                {
                    "name": "UserPreferredProducts"
                },
                {
                    "name": "JoinTopProductsWithPreferredProducts"
                },
                {
                    "name": "DerivedColumnsForMerge"
                },
                {
                    "name": "Filter1"
                }
            ],
            "script": "source(output(\n\t\tvisitorId as string,\n\t\ttopProductPurchases as (productId as string, itemsPurchasedLast12Months as string)[]\n\t),\n\tallowSchemaDrift: true,\n\tvalidateSchema: false,\n\tignoreNoFilesFound: false,\n\tdocumentForm: 'arrayOfDocuments',\n\twildcardPaths:['online-user-profiles-02/*.json']) ~> EcommerceUserProfiles\nsource(output(\n\t\tcartId as string,\n\t\tpreferredProducts as integer[],\n\t\tproductReviews as (productId as integer, reviewDate as string, reviewText as string)[],\n\t\tuserId as integer\n\t),\n\tallowSchemaDrift: true,\n\tvalidateSchema: false,\n\tformat: 'document') ~> UserProfiles\nEcommerceUserProfiles derive(visitorId = toInteger(visitorId)) ~> userId\nuserId foldDown(unroll(topProductPurchases),\n\tmapColumn(\n\t\tvisitorId,\n\t\tproductId = topProductPurchases.productId,\n\t\titemsPurchasedLast12Months = topProductPurchases.itemsPurchasedLast12Months\n\t),\n\tskipDuplicateMapInputs: false,\n\tskipDuplicateMapOutputs: false) ~> UserTopProducts\nUserTopProducts derive(productId = toInteger(productId),\n\t\titemsPurchasedLast12Months = toInteger(itemsPurchasedLast12Months)) ~> DerivedProductColumns\nUserProfiles foldDown(unroll(preferredProducts),\n\tmapColumn(\n\t\tpreferredProductId = preferredProducts,\n\t\tuserId\n\t),\n\tskipDuplicateMapInputs: false,\n\tskipDuplicateMapOutputs: false) ~> UserPreferredProducts\nDerivedProductColumns, UserPreferredProducts join(visitorId == userId,\n\tjoinType:'outer',\n\tpartitionBy('hash', 30,\n\t\tproductId\n\t),\n\tbroadcast: 'left')~> JoinTopProductsWithPreferredProducts\nJoinTopProductsWithPreferredProducts derive(isTopProduct = toBoolean(iif(isNull(productId), 'false', 'true')),\n\t\tisPreferredProduct = toBoolean(iif(isNull(preferredProductId), 'false', 'true')),\n\t\tproductId = iif(isNull(productId), preferredProductId, productId),\n\t\tuserId = iif(isNull(userId), visitorId, userId)) ~> DerivedColumnsForMerge\nDerivedColumnsForMerge filter(!isNull(productId)) ~> Filter1\nFilter1 sink(allowSchemaDrift: true,\n\tvalidateSchema: false,\n\tformat: 'delta',\n\tcompressionType: 'snappy',\n\tcompressionLevel: 'Fastest',\n\tfileSystem: 'wwi-02',\n\tfolderPath: 'top-products',\n\ttruncate:true,\n\tmergeSchema: false,\n\tautoCompact: false,\n\toptimizedWrite: false,\n\tvacuum: 0,\n\tdeletable:false,\n\tinsertable:true,\n\tupdateable:false,\n\tupsertable:false,\n\tmapColumn(\n\t\tvisitorId,\n\t\tproductId,\n\t\titemsPurchasedLast12Months,\n\t\tpreferredProductId,\n\t\tuserId,\n\t\tisTopProduct,\n\t\tisPreferredProduct\n\t),\n\tskipDuplicateMapInputs: true,\n\tskipDuplicateMapOutputs: true) ~> DataLake"
        }
    }
}