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The double character "WixAction: InstallExecuteSequence / RemoveExistingProducts" was found. This usually means the identifier is duplicated

I am developing an installer project using the WiX 3.9 toolkit. I am trying to uninstall a previous version while installing a new version. I tried the following in product.wxs,

<Product Id="*" Name="WIXDemoApp" Language="1033" Version="1.0.0.0" Manufacturer="Man name" UpgradeCode="993d89e6-07ec-4d33-abc5-957360bc66e1"> <Property Id="PREVIOUSVERSIONSINSTALLED" Secure="yes" /> <Upgrade Id="89CF8BE7-05EE-4C7E-9EFC-0249DD260EBB"> <UpgradeVersion Minimum="1.0.0.0" Maximum="99.0.0.0" Property="PREVIOUSVERSIONSINSTALLED" IncludeMinimum="yes" IncludeMaximum="no" /> </Upgrade> <Upgrade Id="89CF8BE7-05EE-4C7E-9EFC-0041DD260EBB"> <UpgradeVersion Minimum="1.0.0.0" Maximum="99.0.0.0" Property="PREVIOUSVERSIONSINSTALLED" IncludeMinimum="yes" IncludeMaximum="no" /> </Upgrade> <InstallExecuteSequence> <RemoveExistingProducts Before="InstallFinalize" /> </InstallExecuteSequence> </Product>

I get this error:

error LGHT0091: A duplicate of the symbol "WixAction: InstallExecuteSequence / RemoveExistingProducts" was found. This usually means that the identifier is duplicated. Make sure that all your identifiers of a certain type (File, Component, Feature) are unique. `

What was the problem and how to fix it?

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c # visual-studio visual-studio-2010 wix
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