I cannot use ":=". When i try using it, i face with error. "An Unhandled exception occurred on the dispatcher thread. Module Name: efiwavelets_.dll
File: C:\Program Files\PTC\Mathcad Prime 7.0.0.0\efiwavelets_.dll; InternalName: efiwavelets; OriginalFilename: efiwaveletsr.dll; FileVersion: 7.0.0.0; FileDescription: Mathcad Wavelets Extension Function Library.; Product: PTC Mathcad Prime; ProductVersion: 7.0.0.0; Debug: False; Patched: False; PreRelease: False; PrivateBuild: False; SpecialBuild: False; Language: English (United States);
Module Memory Size: 561152
Module Name: efisignal_.dll
File: C:\Program Files\PTC\Mathcad Prime 7.0.0.0\efisignal_.dll; InternalName: efisignal; OriginalFilename: efisignalr.dll; FileVersion: 7.0.0.0; FileDescription: Mathcad Signal Extension Function Library.; Product: PTC Mathcad Prime; ProductVersion: 7.0.0.0; Debug: False; Patched: False; PreRelease: False; PrivateBuild: False; SpecialBuild: False; Language: English (United States);
Module Memory Size: 245760
Module Name: efispecial_.dll
File: C:\Program Files\PTC\Mathcad Prime 7.0.0.0\efispecial_.dll; InternalName: efispecial; OriginalFilename: efispecialr.dll; FileVersion: 7.0.0.0; FileDescription: Mathcad Special Extension Function Library.; Product: PTC Mathcad Prime; ProductVersion: 7.0.0.0; Debug: False; Patched: False; PreRelease: False; PrivateBuild: False; SpecialBuild: False; Language: English (United States);
Module Memory Size: 266240
Module Name: efibessel_.dll
File: C:\Program Files\PTC\Mathcad Prime 7.0.0.0\efibessel_.dll; InternalName: efibessel; OriginalFilename: efibesselr.dll; FileVersion: 7.0.0.0; FileDescription: Mathcad Bessel Extension Function Library.; Product: PTC Mathcad Prime; ProductVersion: 7.0.0.0; Debug: False; Patched: False; PreRelease: False; PrivateBuild: False; SpecialBuild: False; Language: English (United States);
Module Memory Size: 466944
Module Name: efifinance_.dll
File: C:\Program Files\PTC\Mathcad Prime 7.0.0.0\efifinance_.dll; InternalName: efifinance; OriginalFilename: efifinancer.dll; FileVersion: 7.0.0.0; FileDescription: Mathcad Finance Extension Function Library.; Product: PTC Mathcad Prime; ProductVersion: 7.0.0.0; Debug: False; Patched: False; PreRelease: False; PrivateBuild: False; SpecialBuild: False; Language: English (United States);
Module Memory Size: 81920
Module Name: efidebug_.dll
File: C:\Program Files\PTC\Mathcad Prime 7.0.0.0\efidebug_.dll; InternalName: efidebug; OriginalFilename: efidebugr.dll; FileVersion: 7.0.0.0; FileDescription: Mathcad Plot Extension Function Library.; Product: PTC Mathcad Prime; ProductVersion: 7.0.0.0; Debug: False; Patched: False; PreRelease: False; PrivateBuild: False; SpecialBuild: False; Language: English (United States);
Module Memory Size: 61440
Module Name: mcdepman.dll
File: C:\Program Files\PTC\Mathcad Prime 7.0.0.0\mcdepman.dll; InternalName: mcdepman; OriginalFilename: mcdepmanr.dll; FileVersion: 7.0.0.0; FileDescription: Mathcad Dependency Manager Library; Product: PTC Mathcad Prime; ProductVersion: 7.0.0.0; Debug: False; Patched: False; PreRelease: False; PrivateBuild: False; SpecialBuild: False; Language: English (United States);
Module Memory Size: 368640
Module Name: mslisp.dll
File: C:\Program Files\PTC\Mathcad Prime 7.0.0.0\mslisp.dll; InternalName: mslisp; OriginalFilename: mslispr.dll; FileVersion: 7.0.0.0; FileDescription: Mathcad Lisp Interpreter; Product: PTC Mathcad Prime; ProductVersion: 7.0.0.0; Debug: False; Patched: False; PreRelease: False; PrivateBuild: False; SpecialBuild: False; Language: English (United States);
Module Memory Size: 122880
Module Name: mspcons-mgd.dll
File: C:\Program Files\PTC\Mathcad Prime 7.0.0.0\mspcons-mgd.dll; InternalName: mspcons-mgd; OriginalFilename: mspcons-mgdr.dll; FileVersion: 7.0.0.0; FileDescription: Mathcad PCons Support Library; Product: PTC Mathcad Prime; ProductVersion: 7.0.0.0; Debug: False; Patched: False; PreRelease: False; PrivateBuild: False; SpecialBuild: False; Language: English (United States);
Module Memory Size: 61440
Module Name: UIAutomationTypes.ni.dll
File: C:\WINDOWS\assembly\NativeImages_v4.0.30319_64\UIAutomationTypes\de0e64a3876835b8ccbf398976dae314\UIAutomationTypes.ni.dll; InternalName: UIAutomationTypes.dll; OriginalFilename: UIAutomationTypes.dll; FileVersion: 4.8.4360.0 built by: NET48REL1LAST_C; FileDescription: UIAutomationTypes.dll; Product: Microsoft® .NET Framework; ProductVersion: 4.8.4360.0; Debug: False; Patched: False; PreRelease: False; PrivateBuild: True; SpecialBuild: False; Language: English (United States);
Module Memory Size: 704512
Module Name: UIAutomationProvider.ni.dll
File: C:\WINDOWS\assembly\NativeImages_v4.0.30319_64\UIAutomationProvider\eb1ea0312831b7dbb0e2ce7d5c7f01a0\UIAutomationProvider.ni.dll; InternalName: UIAutomationProvider.dll; OriginalFilename: UIAutomationProvider.dll; FileVersion: 4.8.4360.0 built by: NET48REL1LAST_C; FileDescription: UIAutomationProvider.dll; Product: Microsoft® .NET Framework; P
