Dataverse solution import errors

Solution import is where ALM problems become visible. The error messages are long, the real cause is usually in the last sentence, and the fix is almost always in the source environment or the target's history rather than in the solution file. This reference lists the failures in the order they occur during an import — dependencies, version and layering, components, connections, and post-import — with what to do about each. For the model behind it, see Power Platform ALM with managed solutions and solution patches vs upgrades.

Getting the real message

The import dialog shows a summary; the Details link and the downloadable XML log hold the component-by-component result. Find the first row with an error — later errors are usually consequences of it. For pipeline imports (pac solution import, Power Platform Build Tools), the same log is in the task output.

Dependencies

"The solution import failed because of a missing dependency: … requires solution 'X' version 'N' or higher"

Cause. A component references something the target does not have — a base solution from your own team, a Microsoft application (Dynamics 365 Sales, Customer Service, Field Service), an ISV solution, or a component that was moved between solutions in the source.

Fix. Import the named solution at the named version or higher first. If the dependency is on a component you moved between your own solutions, either export both together or restore the component to its original solution.

Prevention. One dependency graph per environment, documented; pipelines that deploy solutions in dependency order. Solution dependencies and managed layer conflicts covers the design.

"Cannot delete component because it is required by another component" / dependencies during upgrade

Cause. An upgrade removes a component that something outside the solution — an unmanaged form, a flow, another solution — still uses.

Fix. Open the component's Show dependencies in the target, remove or update the dependents, then retry. Stage-for-upgrade lets you inspect before applying.

Version and layering

"The solution version being imported is lower than the version installed"

Cause. Managed solutions cannot go backwards. A pipeline picked up an older artefact, or a developer exported without bumping the version.

Fix. Increment the version in the source and re-export.

Prevention. Let the pipeline set the version from the build number.

"A managed solution cannot overwrite the X component with Id=… which has an unmanaged base instance"

Cause. The component exists in the target as unmanaged — created by hand, or by an unmanaged import during early development — and a managed solution from the same publisher now wants to own it.

Fix. Delete the unmanaged component in the target (check dependencies first) and re-import. If the target is production and the unmanaged component holds data (a table), the cleanup is a project: export the data, delete, import managed, reload.

Prevention. Never import unmanaged into test or production; unmanaged is for development environments only.

Import succeeds but the change does not appear

Cause. An unmanaged (active) customisation in the target sits above the managed layer and shadows it — someone edited the form, view, or column directly in production. The Solution layers view on the component shows the stack.

Fix. Remove the active customisation on that component (Remove active customizations in the layers pane) so the managed layer shows through.

Prevention. No hand edits in test or production, enforced by Managed Environments and security roles.

"The publisher of the solution does not match" / prefix conflicts

Cause. Components created under a different publisher prefix than the solution's, or two solutions from different publishers trying to own the same component.

Fix. Keep one publisher per team and create components inside the solution so they inherit its prefix.

Components

"Import failed: the language for the solution is not installed" / language code errors

Cause. The solution carries labels for a language (for example 1053 Swedish) that is not enabled in the target.

Fix. Enable the language in the target environment's settings, wait for provisioning, retry.

"The attribute type cannot be changed" / "Cannot change the data type of column X"

Cause. The column's type or length was changed in the source in a way managed solutions cannot apply — type changes are not supported, and some length reductions are refused.

Fix. Create a new column, migrate data, and obsolete the old one.

"Cannot import solution because it contains a component that is not solution-aware" / canvas app or flow fails to import

Cause. A canvas app or flow referenced by the solution lives outside solutions in the source, or references a connector, environment variable, or custom connector that is missing in the target.

Fix. Add the component to the solution in the source; ensure custom connectors and environment variable definitions ship in a base solution.

"Flow client error returned with status code Bad Request and status InvalidOpenApiFlow" / "The workflow with id X cannot be imported"

Cause. The flow definition references something the target cannot resolve — a connector not available or blocked by DLP, a child flow not yet imported, an environment variable without a value, or an action from a connector version that differs.

Fix. Read the inner message: it names the action and the missing reference. Import child flows first, set environment variables, check the DLP policy.

Plug-in assembly or step errors: "The plug-in type X is not registered" / "Assembly version has changed"

Cause. The assembly in the solution has a different AssemblyVersion than the one installed, or a step references a type that no longer exists.

Fix. Keep AssemblyVersion fixed across releases; remove steps for deleted types before exporting. Dataverse plug-in exceptions covers the registration rules.

Solution checker blocks the import (Managed Environments)

Cause. The target environment enforces solution checker at Block, and the solution has critical or high findings.

Fix. Run the checker in the source, fix the findings, re-export; or lower enforcement to Warn for an emergency deployment with sign-off. Solution checker and app checker lists the rule categories.

Connections and environment variables

Import pauses at "Connection references" / flows imported turned off

Cause. The solution contains connection references without a connection in the target, or environment variables without a current value. The importer prompts interactively; in a pipeline it fails unless the values are supplied in a deployment settings file.

Fix. Create connections under a service account in the target and supply them on import; provide environment variable values through the deployment settings file (pac solution create-settings generates it). Flows imported without connections are switched off — turn them on after connections are set.

Prevention. Connection references and environment variables and solution import and export pipelines cover the unattended pattern.

"Environment variable value is missing" at runtime after a clean import

Cause. A default value was set in the source but no current value in the target, and the default was excluded from the export (the recommended setting).

Fix. Set the current value in the target; never rely on defaults for environment-specific settings.

Post-import

"Publish all customizations" fails / "Invalid XML"

Cause. A form XML or sitemap that is invalid after merging layers — usually an unmanaged edit that conflicts with the imported form.

Fix. Remove the active customisation on the component and publish again.

Import timed out / "The import is taking longer than expected"

Cause. Large solutions with many tables and flows exceed the synchronous import window; the import usually continues in the background.

Fix. Wait and check the solution history before retrying; use asynchronous import (--async) in pipelines and split very large solutions into layers.

Data lost after upgrade

Cause. An upgrade that removed a table or column removes the data with it; a patch cannot remove components, an upgrade can and does.

Fix. Restore from a pre-import backup — which is why a backup before every production import is the rule. Solution history and rollback strategies covers the safety net.

The order that avoids most of this

Base solution with tables, publisher, environment variable definitions, and custom connectors first; feature solutions that depend on it second; flows and canvas apps in the feature solution that owns their tables; deployment settings files per environment; stage-for-upgrade in production with a backup taken first. Teams that deploy in that order see connection prompts and missing-dependency errors on the first import and rarely again.