# Troubleshooting If a Partek Flow task fails (no report is produced), please follow the directions in [Reporting a problem](/partek/getting-help.md). If the task report is produced, but the results are missing for some features represented by "?"\ (Figure 1), it may be because something went wrong with the estimation procedure. To better understand this, use the information available in the **Extra details report** ![](/files/sz6w4N0CkMuTui1rc3AN) (Figure 1). This type of information is present for many tasks, including Differential Analysis and Survival Analysis.

Figure 1. Use “View extra details report” button to see why the results are missing.

Click the **Extra details report** ![](/files/sz6w4N0CkMuTui1rc3AN)for the feature of interest (Figure 1). This will display the *Extra details report* (Figure 2). When the estimation procedure fails, a red triangle will be present next to the information criteria value. Hover over the triangle to see a detailed error message.

Figure 2. . The error message shows up if one hovers over the colored triangle

In many cases, estimation failure is due to low expression, filter out low expression features or choose a reasonable normalization method will resolve this issue. Sometimes the estimation results are not missing but the reported values look inadequate. If this is the case, the *Extra details report* may show that the estimation procedure generated a warning, and the triangle is yellow. To remove suspicious results in the report, set **Use only reliable estimation results** to *Yes* in the **Advanced Options** (Figure 3). The warnings will then be treated the same way as estimation failures.

Figure 3. If only reliable results are used, features with warnings are not reported.

To see the results for as many features as possible, regardless of how reliable they are, set **Use only reliable estimation results** to *No* and the result will be reported unless there is an estimation failure. For example, DESeq2 uses Cook’s distances to flag features with outlying expression values and if “Use reliable results” is set to Yes (Figure 3) the p-values for such features are not reported which may lead to some missing values in the report (set **Use only reliable estimation** results to *No* to avoid this). ## Additional Assistance If you need additional assistance, please visit [our support page](http://www.partek.com/support) to submit a help ticket or find phone numbers for regional support. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://help.connected.illumina.com/partek/partek-flow/user-manual/task-menu/differential-analysis/troubleshooting.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.