Upgrade is not able to open older version

[NewRezSapien]

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*** Please fill in the fields below. If you leave fields empty or specify 'latest' rather than the actual version your answer will be delayed as we will be forced to ask you for this information. ***

Product, version and build: PowerShell Studio 2010, 5.7.178
32 or 64 bit version of product: 64 bit
Operating system: Win 10
32 or 64 bit OS: 64 bit

*** Please add details and screenshots as needed below. ***
Output Window Shows the below. The MainForm.psf will not open in the Tabs workspace. I tried to do a save and reopen the project and I get the same results.

MainForm.psf: '', hexadecimal value 0x17, is an invalid character. Line 1572, position 2.
MainForm.psf: Unable to determine object class.
Object reference not set to an instance of an object.
About.psf: This file was created using an older version.
About.psf: On Save, a backup of this file will be created before converting to the latest version.
MainForm.psf: '', hexadecimal value 0x17, is an invalid character. Line 1572, position 2.
MainForm.psf: Unable to determine object class.
Object reference not set to an instance of an object.
MenuForm.psf: This file was created using an older version.
MenuForm.psf: On Save, a backup of this file will be created before converting to the latest version.
About.psf: This file was created using an older version.
About.psf: On Save, a backup of this file will be created before converting to the latest version.
About.psf: This file was created using an older version.
About.psf: On Save, a backup of this file will be created before converting to the latest version.
MainForm.psf: This file was created using an older version.
MainForm.psf: On Save, a backup of this file will be created before converting to the latest version.
MainForm.psf: '', hexadecimal value 0x17, is an invalid character. Line 1572, position 2.
MainForm.psf: Unable to determine object class.
Object reference not set to an instance of an object.
MainForm.psf: '', hexadecimal value 0x17, is an invalid character. Line 1572, position 2.
MainForm.psf: Unable to determine object class.
Object reference not set to an instance of an object.
MainForm.psf: '', hexadecimal value 0x17, is an invalid character. Line 1572, position 2.
MainForm.psf: Unable to determine object class.
Object reference not set to an instance of an object.
About.psf: This file was created using an older version.
About.psf: On Save, a backup of this file will be created before converting to the latest version.
MainForm.psf: '', hexadecimal value 0x17, is an invalid character. Line 1572, position 2.
MainForm.psf: Unable to determine object class.
Object reference not set to an instance of an object.
MainForm.psf: '', hexadecimal value 0x17, is an invalid character. Line 1572, position 2.
MainForm.psf: Unable to determine object class.
Object reference not set to an instance of an object.
Credentials.psf: This file was created using an older version.
Credentials.psf: On Save, a backup of this file will be created before converting to the latest version.

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[brittneyr]

Please answer the following questions:
- What was the previous version of PowerShell Studio you had installed?
- What is the file encoding of MainForm.psf?
- If you are able to, can you please upload your project or just MainForm.psf here so we can better assist you:
https://www.sapien.com/support/upload

[NewRezSapien]

It appears there was corruption at the end of the file at the time of conversion. Found the backup and notice the following character Ěnø The paste changed what I am seeing. The backup file ends with </File>. I replaced the text. But now when I try to run it it gives me the following error
Length cannot be less than zero.
Parameter name: length

Does not give me a line number to look at. I have attach the Main.psf file. I was going to attach the backup but does not allow me.

Thanks

[brittneyr]

I have not been able to reproduce this behavior on another file. I did replace the weird hexadecimal value on line 1572 with </File> and I was able to open the file with PowerShell Studio as you stated:

MainForm.psf

(84.74 KiB) Downloaded 116 times

[NewRezSapien]

I did the same if you saw in my post but after that yes I was able to open it. But when I run it gives me the following error
Length cannot be less than zero.
Parameter name: length

Does not give me a line number to look at. I do not have any reference to a length parameter in th code that I could find.

[brittneyr]

Is this a error in the output panel or an error message popping up? If its an error in the output panel, it has to do with your code. I would recommend adding checks for null.