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Aurea CRM 15.25.2: CRM Web Fails to Start with “DLL version mismatch error” (Fixed in 15.25.6+)

Overview

After installing or upgrading to Aurea CRM 15.25.2 (Windows setup → Web setup), CRM Web may fail immediately on startup with a reported "DLL version mismatch error".

This behavior was confirmed as an Aurea CRM 15.25.2 installer/configuration defect where shipped DLL binding/redirection configuration did not align with the DLL versions included in the 15.25.2 package (reported around a Newtonsoft.Json version mismatch). The fix is included in Aurea CRM 15.25.6 (and later).

Solution

Issue

After installing Aurea CRM 15.25.2 (running Windows setup and Web setup), CRM Web fails to start with a reported message:

"DLL version mismatch error"

Affected / Fixed Versions

  • Affected: Aurea CRM v15.25.2
  • Fixed in: Aurea CRM v15.25.6 (and later)

What causes this

In v15.25.2, the packaged configuration for DLL redirection/binding did not match the DLL versions shipped with the installer. The reported example involved a Newtonsoft.Json DLL version update while configuration still referenced an older version, leading to a runtime mismatch when CRM Web starts.

How it was diagnosed

  1. The issue was treated as a version-specific regression because it was reported against a new release (15.25.2).
  2. The problem was reproduced via a fresh/local installation of Aurea CRM 15.25.2, confirming the same startup failure.
  3. After reproducibility was confirmed, an engineering work item (<engineering_issue_id>) was opened and a fix was implemented for a subsequent release.

Resolution

Upgrade Aurea CRM to v15.25.6 (or later).

  • Obtain the Aurea CRM v15.25.6 installer/package through your standard distribution channel.
  • Perform the upgrade following your normal Aurea CRM upgrade procedure for your environment (Windows + Web components as applicable).
  • After upgrade, start CRM Web and confirm the application loads normally.

Verification

After upgrading to v15.25.6+:

  1. Start/restart the CRM Web site in IIS (and recycle the related application pool if that is part of your standard restart procedure).
  2. Browse to https://your_instance.domain.com/.
  3. Confirm CRM Web loads without the "DLL version mismatch error" and users can log in successfully.

If you cannot upgrade immediately

If an upgrade to v15.25.6+ is not possible in the short term, collect the full exact error text and relevant web startup logs and open a support request to discuss options available for your deployment and release constraints.

Frequently Asked Questions

1. How do I know this is the same issue?
You are likely affected if you installed Aurea CRM 15.25.2 and CRM Web fails to start immediately after installation with a reported "DLL version mismatch error", and the problem appears related to DLL binding/redirection configuration not matching shipped DLL versions.
2. What version contains the fix?
Engineering delivered the fix for inclusion in Aurea CRM v15.25.6. Upgrading to 15.25.6 or later is the recommended resolution.
3. Do I need to change web.config/settings files manually?
The durable fix is delivered in v15.25.6+. If you are considering manual changes as a temporary measure, coordinate with support to avoid introducing additional mismatches or unsupported configuration changes.
4. What should I provide to support if the issue persists after upgrading?
Provide (1) your exact Aurea CRM version/vertical, (2) the full exact error message text, and (3) CRM Web logs from ..\web.data\log\web.log captured immediately after reproducing the issue.
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  1. Priyanka Bhotika

  2. Posted

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